DELL
optiplex 755
™

™

technical guide book
inside the optiplex 755

table of contents

Overview

3

Mini Tower Computer (MT) View

5

Desktop Computer (DT) View

6

Small Form Factor Computer (SFF) View

7

Ultra Small Form Factor Computer (USFF) View

8

Marketing System Configurations
Operating System, Chipset
Processor

9
10

Advanced System Manageability Modes, Deployment Mode Options

11

Memory

12

Drives and Removable Storage

13

System Board Connectors

14

System Board Connector Maximum Allowable Dimensions,
Graphics/Video Controller

15

External Ports/Connectors

20

Communications – Network Adapter (NIC)

21

Communications – Modem

23

Audio and Speakers, Keyboard and Mouse, Security

24

Service and Support, Software

25

Detailed Engineering Specifications
System Dimensions (Physical)

26

System Level Environmental and Operating Conditions

27

Power		

28

Audio		

29

Hard Drives

30

Optical Drives

34

BIOS Defaults

38

Chassis Enclosure and Ventilation Requirements

41

Regulatory Compliance and Environmental
Acoustic Noise Emission Information

42

Dell™ OptiPlex™ 755 technical guide

Robust mainstream
desktop designed
to meet your
needs , now and
in the future
The new Dell OptiPlex 755 offers a compelling, versatile solution that can help you meet evolving business needs with the right
technologies and services. Thanks to Dell’s innovative approach to scalable remote client management, the OptiPlex 755 offers
you a choice between several systems-management options. These options allow you to select an approach that’s appropriate
for your current infrastructure, while easily scaling to meet future needs. Options include:
• Widely installed ASF (Alert Standard Format) standards-based technology, which supports basic in- and out-of-band
hardware inventory, alerting, and power control
• Intel® Active Management Technology (Intel AMT), which adds encrypted communications to ASF requirements, and also
provides remote diagnosis and troubleshooting capabilities
• Intel® vPRO™ processor-based technology adds processor-specific security technologies to Intel AMT’s functionality
In addition, Dell continues to expand our Deployment Services — now featuring ImageDirect, a web-based tool that can enable you
to build and apply custom images for current and future systems. And because we know data security is a vital concern, the OptiPlex
755 offers optional RAID 1 support for real-time data-mirroring protection. Plus, those who elect for a full vPRO platform can enjoy
additional advanced security and remote remediation features.

version 1.0

3 3

Dell™ OptiPlex™ 755 technical guide

advanced remote management: New capabilities that allow IT to have greater control
• Your choice of flexible options — from ASF 2.0 to Intel AMT 3.0, and even full Intel vPro processor technology
• Standards-based management (DASH 1.0 and WS-MAN) help ensure simplicity and interoperability
• Dell Client Manager brings it all together in one management console
Power Efficiency: Productivity and power savings in a proven, reliable design
• Dell’s Energy Smart is a unique approach to energy efficient computing which includes hardware and software, tool,
and partnerships.
• Energy Smart hardware and software includes Intel® Core™ 2 Duo processors, efficient management power settings and
remote power policy management, available 80+ power supplies and ENERGY STAR® 4.0 configurations
• Dell’s online Energy Calculator indicates potential savings of up to 78% by choosing the most efficient configurations
• Dell is working alongside industry leaders and standards organizations worldwide to help drive revolutionary change
smart security: Strategic, comprehensive endpoint solutions for all types of businesses
• Intel vPro technology helps simplify asset inventory, isolation of virus-infected PCs, security patch deployment and more
• RAID 1 support helps keep data intact and accessible via real-time redundancy
• Built-in TPM 1.2 helps protect the network from unauthorized access, while enabling multi-factor authentication via
optional Smart Card Reader and/or fingerprint reader
Dell Deployment Services: Image management, customization and deployment made easy
• Specific provisioning and pre-configured setting options for iAMT and Intel vPro technology customers
• ImageDirect allows you to create, manage and load your custom images to Dell client systems
• Microsoft® Windows Vista® Assessment and Migration options help streamline and optimize your deployment processes

SIMPLY PUT:

remote management, smart
security, and customized
deployments help simplify
your operations
version 1.0

4 4

Dell™ OptiPlex™ 755 technical guide

Mini Tower Computer (MT) View

1

1
2
3
9

11 10

6

6
5

front view

5

4

8 7

5.25-inch drive bay

4

1

card slots
serial port

2

5.25-inch drive bay

3

3.5-inch drive bay

3

power connector

4

USB 2.0 connectors (2)

4

voltage selection switch

5

LAN indicator light

5

padlock ring

6

diagnostic lights

6

cover release latch

7

parallel port

8

VGA port

8
7

7

power button

8

power light

9

hard drive activity light

10

headphone connector

11

microphone connector

2

1

4

System Board Components

2

3

22

5

21
20

19

18
6
7

17

10

14
12

15

3

2

1

16

back view

7
9

11

13
23

24

25

28
26 27

8

29
30

1

speaker connector (INT_SPKR)

2

fan (FAN_CPU)

3

processor connector (CPU)

4

processor power connector (12VPOWER)

5

memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4)

6

password jumper (PSWD)

7

SATA drive connectors (SATA0, SATA1, SATA2, SATA3)

8

front-panel connector (FRONTPANEL)

9

power connector (POWER)

10

external SATA connector (eSATA)

11

internal USB (INT_USB)

12

RTC reset jumper (RTCRST)

13

intrusion switch connector (INTRUDER)

14

battery socket (BATTERY)

15

PCI Express x16 connector (SLOT1)

16

PCI Express x1 connector (SLOT4)

17

PCI connector (SLOT2)

18

PCI connector (SLOT3)

19

serial connector (SERIAL2)

20

system board speaker (BEEP)

26

4x USB 2.0 ports

21

aux power LED (aux_LED)

27

1 - RJ 45 network port

22

floppy connector (DSKT)

28

2 - USB 2.0 ports

23

VGA connector

29

stereo in/microphone

24

parallel port

30

stereo out

25

serial port

version 1.0

5 5

Dell™ OptiPlex™ 755 technical guide

desktop Computer (dT) View

11

4

1

10

8

2
6

9

7

3

1

4

5

USB 2.0 connectors (2)

7

hard drive activity light

1

card slots

2

LAN indicator light

8

headphone connector

2

serial port

3

power button

9

microphone connector

3

power connector

4

Dell badge

10

3.5-inch drive bay

4

voltage selection switch

5

power light

11

5.25-inch drive bay

5

padlock ring

6

diagnostic lights

6

cover-release latch

7

parallel port

8

VGA port

System Board Components

3

1
22

2

21

4

20
19

18

17

5
16

6
9

13
14

11

12

version 1.0

6

back view

1

15

5

8

2

front view

3

7

10

6
8

7

1

internal speaker (INT_SPKR)

2

processor connector (CPU)

3

processor power connector (12VPOWER)

4

memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4)

5

password jumper (PSWD)

6

SATA connectors (SATA0, SATA1, SATA2)

7

front-panel connector (FRONTPANEL)

8

power connector (POWER)

9

external SATA connector (eSATA)

10

internal USB (INT_USB)

11

RTC reset jumper (RTCRST)

12

intrusion switch connector (INTRUDER)

13

battery socket (BATTERY)

14

PCI Express x16 connector (SLOT1)

15

PCI connector (SLOT2)

16

PCI connector (SLOT3)

17

riser connector (uses PCI-E port/SLOT1 and PCI port/SLOT2)

18

serial connector (SERIAL2)

19

system board speaker (BEEP)

20

aux power LED (aux_LED)

21

floppy connector (DSKT)

22

fan connector (FAN_CPU)

6 6

Dell™ OptiPlex™ 755 technical guide

small form factor Computer (sff) View

11

4
1

10

8

2

3

7

4
1

5

9

6

USB 2.0 connectors (2)

7

power light

1

card slots

2

power button

8

headphone connector

2

serial port

3

Dell badge

9

microphone connector

3

power connector

4

LAN indicator light

10

3.5-inch drive bay

4

voltage selection switch

5

diagnostic lights

11

5.25-inch drive bay

5

padlock ring

6

hard drive activity light

6

cover-release latch

7

parallel port

8

VGA port

3

1

System Board Components

21

2

20
19

4

18

17

5
16
10

14
12
11

13

version 1.0

6

back view

1

15

5

8

2

front view

3

7

6

9
8

6

7

1

internal speaker connector (INT_SPKR)

2

processor connector (CPU)

3

processor power connector (12VPOWER)

4

memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4)

5

password jumper (PSWD)

6

SATA connectors (SATA0, SATA1)

7

front-panel connector (FRONTPANEL)

8

power connector (POWER)

9

fan connector (FAN_HDD)

10

eSATA connector (eSATA)

11

internal USB connector (INT_USB)

12

RTC reset jumper (RTCRST)

13

intrusion switch connector (INTRUDER)

14

battery socket (BATTERY)

15

PCI Express x16 connector (SLOT1)

16

PCI connector (SLOT2)

17

serial connector (SERIAL2)

18

system board speaker (BEEP)

19

aux power LED (aux_LED)

20

floppy drive connector (DSKT)

21

fan connector (FAN_CPU)

7 7

Dell™ OptiPlex™ 755 technical guide

Ultra small form factor Computer (Usff) View

2

1

8

3

9

2

5

3

4

6

5

1

4

7

6

7

back view

front view

1

USB connectors (2)

6

vents

1

diagnostic lights

2

headphone connector

7

module bay

2

computer cover release knob
parallel port

3

microphone connector

8

hard drive access light

3

4

power light

9

vents

4

power connector

5

power button

5

vents

6

serial port

7

DVH port

2

System Board Components

3
4
5
6

1

14

7

13

8

12

10

9

11

15

version 1.0

19
18
16

17

20

22
21

1

fan connector (FAN_FRONT)

2

internal speaker connector (INT_SPKR)

3

system board speaker (BEEP)

4

channel B memory connector (DIMM_2)

5

channel A memory connector (DIMM_1)

6

SATA data cable connector (SATA0)

7

battery (BATT)

8

password jumper (PSWD)

9

hard drive fan connector (FAN_HDD)

10

clear CMOS jumper (RTCRST)

11

hard drive power connector (SATA_PWR)

12

fan connector (FAN_REAR)

13

intrusion switch connector (INTRUDER)

14

processor (CPU)

15

DVI-1 connector

16

parallel port

17

serial port

18

1- RJ 45 network connector

19

2 - USB 2.0 connectors

20

3 - USB 2.0 ports

21

line-out connector

22

line-in microphone connector

88

Dell™ OptiPlex™ 755 technical guide

Marketing System Configurations
Offerings may vary by region. For more information regarding the configuration of your computer, click
Start Help and Support and select the option to view information about your computer.
Operating System
One of the following Operating Systems will be preinstalled.
MT

Windows Vista® Operating System
Windows XP® Operating System

SFF

USFF

Windows Vista® Ultimate 32-bit, Windows Vista® Business 32- and 64-bit,
Windows Vista® Home Basic 32 bit
Windows® XP Professional SP2, Windows® XP Home Edition SP2
(all 32-bit only)

Other
OS Media Support

DT

FreeDOS for (n-series), Red Flag Linux (China only)

✓

✓

✓

✓

MT

DT

SFF

USFF

Chipset

Chipset

Intel® Q35 Express Chipset (ICH9DO)

Non-volatile Memory on Chipset
BIOS Configuration SPI (serial peripheral interface)

32Mbit (4MB) located at SPI_FLASH on chipset

TPM 1.2 Security Device (Trusted Platform Module)

16KB located at TPM1P2 on chipset

NIC EEPROM

version 1.0

LOM configuration contained within SPI_FLASH – no dedicated LOM EEPROM

9 9

Dell™ OptiPlex™ 755 technical guide

Processor
Global Standard Products (GSP) are a subset of Dell’s relationship products that are managed for availability and synchronized
transitions on a worldwide basis. They ensure the same platform is available for purchase globally. This allows customers to reduce
the number of configurations managed on a worldwide basis, thereby reducing their costs. They also enable companies to implement
global IT standards by locking in specific product configurations worldwide. The following GSP processors identified below will be made
available to Dell customers.
Processor numbers are not a measure of performance.
Processor (speed, cache, FSB)

MT

DT

SFF

USFF

Intel® Core™ 2 Quad with Intel VT, Enhanced Intel SpeedStep Technology, Intel 64 and Execute Disable Bit
Intel Core 2 Quad Q6700 Processor (2.66GHz, 8MB L2 cache, 1066MHz FSB, VT)

✓

✓

✓

Intel Core 2 Quad Q6600 Processor (2.4GHz, 8MB L2 cache, 1066MHz FSB, VT)

✓

✓

✓

Intel® Core 2 Duo with Intel vPro Technology, Intel VT, Intel TXT, Enhanced Intel SpeedStep Technology, Intel 64 and Execute Disable Bit
Intel Core 2 Duo E6850 Processor (3.0GHz, 4MB L2 cache, 1333MHz FSB, vPro, VT)

X-GSP

X-GSP

X-GSP

X-GSP

Intel Core 2 Duo E6750 Processor (2.66GHz, 4MB L2 cache, 1333MHz FSB, vPro, VT)

X-GSP

X-GSP

X-GSP

X-GSP

Intel Core 2 Duo E6550 Processor (2.33GHz, 4MB L2 cache, 1333MHz FSB, vPro, VT)

X-GSP

X-GSP

X-GSP

X-GSP

Intel® Core 2 Duo with Enhanced Intel SpeedStep Technology, Intel 6.4 and Execute Disable Bit
Intel Core 2 Duo E4600 Processor (2.4GHz, 2MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Core 2 Duo E4500 Processor (2.2GHz, 2MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Core 2 Duo E4400 Processor (2.0GHz, 2MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Core 2 Duo E2180 Processor (2.0GHz, 1MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Core 2 Duo E2160 Processor (1.8GHz, 1MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Core 2 Duo E2140 Processor (1.6GHz, 1MB L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Celeron 440 Processor (2.0GHz, 512K L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel Celeron 430 Processor (2.0GHz, 512K L2 cache, 800MHz FSB)

✓

✓

✓

✓

Intel® Celeron with Execute Disable Bit

version 1.0

10 10

Dell™ OptiPlex™ 755 technical guide

advanced system manageability modes
MT

DT

SFF

USFF

Secure Advanced Client Systems Management

✓

✓

✓

✓

Advanced Client Systems Management
(w/ iAMT)

✓

✓

✓

✓

Basic Client Systems Management (w/ ASF)

✓

✓

✓

✓

Client Systems Management Disabled

✓

✓

✓

✓

1

(w/ vPro)

1

Secure Advanced Client Systems Management requires Intel Core 2 Duo or Core 2 Quad Processors in addition to iAMT.

Deployment Mode Options
Requires Secure Advanced Client Systems Management (with/vPro) or Advanced Client Systems Management (with iAMT) modes only.
Deployment options to enable easy deployment of systems management options.

version 1.0

MT

DT

SFF

USFF

One-Touch Provisioning Support

✓

✓

✓

✓

TLS Encryption Disabled

✓

✓

✓

✓

Legacy ASF Setting for iAMT

✓

✓

✓

✓

11 11

Dell™ OptiPlex™ 755 technical guide

Memory
Your computer supports a maximum of 8GB of memory when you use four 2GB DIMMs; however, 32-bit operating systems, such as the
32-bit version of Microsoft® Windows® XP, can only use a maximum of 4GB of address space. Moreover, certain components within the
computer require address space in the 4GB range. Any address space reserved for these components cannot be used by computer
memory; therefore, the amount of memory available to the operating system is less than 4GB.
The entire 8GB memory range is available to 64-bit operating systems.
Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed
in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
MT

DT

SFF

USFF

DDR2 Synch DRAM Non-ECC Memory 667MHz or 800MHz speeds

DIMM Slots

4

4

4

2

DIMM Capacities

Up to 2GB

Up to 2GB

Up to 2GB

Up to 2GB

Minimum Memory

512MB

512MB

512MB

512MB

Maximum Memory with 667MHz Speed Memory

8GB1

8GB1

8GB1

4GB1

Maximum Memory with 800MHz Speed Memory

8GB1

8GB1

8GB1

4GB1

4GB1 DDR2 Non-ECC SDRAM, 800MHz,
(2 DIMM)

✓

✓

✓

✓

4GB DDR2 Non-ECC SDRAM, 800MHz,
(4 DIMM)

✓

✓

✓

2GB DDR2 Non-ECC SDRAM, 800MHz,
(1DIMM)

✓

✓

✓

✓

2GB DDR2 Non-ECC SDRAM, 800MHz,
(2 DIMM)

✓

✓

✓

✓

1GB DDR2 Non-ECC SDRAM, 800MHz,
(1 DIMM)

✓

✓

✓

✓

4GB1 DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)

✓

✓

✓

4GB1 DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)

✓

✓

✓

3GB DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)

✓

✓

✓

2GB DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)

✓

✓

✓

2GB DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)

✓

✓

✓

✓

1GB DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)

✓

✓

✓

✓

1GB DDR2 Non-ECC SDRAM, 667MHz,
(1 DIMM)

✓

✓

✓

✓

512MB DDR2 Non-ECC SDRAM, 667MHz,
(1 DIMM)

✓

✓

✓

✓

Configurations:
800MHz Memory Configurations

1

667MHz Memory Configurations

1

✓

The total amount of available memory will be less, depending on actual system configuration.

version 1.0

12 12

Dell™ OptiPlex™ 755 technical guide

Drives and Removable Storage
MT

DT

SFF

USFF

3.5-inch bay Externally Accessible

1

1*

1 (slimline)

D/bay module

3.5-inch bay Internally Accessible

2

1*

1

1

5.25-inch bay

2

1

1 (slimline)

Hard Drives Supported1

2

2

1

1

Optical Drives Supported

2

1

1

D/bay module

SATA (number of connectors - includes one dedicated

5

4

3

1

Floppy/Diskette

1

1

1

eSATA (requires additional bracket)

1

1

1

80GB2 SATA 10K RPM HDD

✓

✓

✓

✓

250GB2 SATA 7200 RPM HDD

✓

✓

✓

✓

160GB2 High Reliability SATA 7200 RPM HDD

✓

✓

✓

✓

160GB2 SATA 7200 RPM HDD

✓

✓

✓

✓

80GB2 SATA 7200 RPM HDD

✓

✓

✓

✓

80GB2 SATA 10K RPM HDD

✓

✓

160GB2 SATA 7200 RPM HDD

✓

✓

320B2 SATA 7200 RPM HDD

✓

✓

500GB2 SATA 7200 RPM HDD

✓

✓

80GB2 SATA 10K RPM HDD

✓

✓

250GB2 SATA 7200 RPM HDD

✓

✓

160GB2 SATA 7200 RPM HDD

✓

✓

80GB2 SATA 7200 RPM HDD

✓

✓

Bays:

Interface:
eSATA on MT, DT & SFF)

Hard Drive: Size, type, speed, RPM

RAID 0 Enhanced Performance:

(includes two matching capacity/speed hard drives)
3

3

3

3

RAID 1 Data Protection:

(includes two matching capacity/speed hard drives)

1

This only pertains to drives physically contained within the chassis and does not refer to HDDs attached via eSATA (including port multiplier), USB or optional 1394.

2

For hard drives, GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity varies with preloaded material and operating environment and will be less.

3

RAID 1 in DT chassis restricted to Western Digital and Samsung HDDs.

* Card length can be longer than standard Half-Length Card but cannot be a Full-Length Card.

version 1.0

13 13

Dell™ OptiPlex™ 755 technical guide

Drives and Removable Storage, cont.
MT

DT

Optical Drive:

SFF

USFF

SFF requires
a slimline
optical drive

USFF requires
a D-module
Slimline drive

DVD+/-RW

16x SATA

8x EIDE

8x EIDE

DVD-ROM

16x SATA

8x EIDE

8x EIDE

48x/32x/48x/16x SATA

24x/24x/24x EIDE

24x/24x/24x EIDE

48x SATA

24x EIDE

24x EIDE

1.44MB

1.44MB (slimline)

1.44MB (D/Bay)

Combo Drive CD-RW
CD-ROM
Floppy Diskette Drive:
Floppy Drive
Media Card Reader: (uses Externally Accessible 3.5-inch bay)

✓

✓

MT

DT

SFF

PCI Slot(s):

2

2

1

PCIe x16 Slot:

1

1

1

PCIe x1 Slot:

1

Flexbay (used for Media Card Reader)

1

1

1

Serial ATA (SATA) (Includes eSATA Connector)

5

4

3

Dell 19-in-1 Media Card Reader

✓

System Board Connectors
See Detailed Engineering Specifications for maximum card dimensions support.

version 1.0

USFF

1

14 14

Dell™ OptiPlex™ 755 technical guide

System Board Connector Maximum Allowable Dimensions
MT

DT

SFF

PCI Slot(s) Dimensions: (HxL)

2

2

1

Height inches/centimeters

4.376 / 11.115

2.731 / 6.89

Length inches/centimeters

6.6 / 16.765*

6.6 / 16.765

PCIe x16 Slot Dimensions: (HxL)

1

1

1

Height inches/centimeters

4.376 / 11.115

2.731 / 6.89

Length inches/centimeters

6.6 / 16.765*

6.6 / 16.765

PCIe x1 Slot Dimensions: (HxL)

USFF

1

Height inches/centimeters

4.376 / 11.115

Length inches/centimeters

6.6 / 16.765

Combo Full Height Riser with 1 PCI and
1 PCIe connector (HxL)

1 /1

Height inches/centimeters

4.376 / 11.115

Length inches/centimeters

6.9 / 17.53**

Dual Full Height Riser with 2 PCI connectors
(HxL)

2

Height inches/centimeters

4.376 / 11.115

Length inches/centimeters

6.9 / 17.53**

* Card length can be longer than standard Half-Length Card but cannot be a Full-Length Card.
** 6.9/17.53 in/cm is longer than the standard Half-Length Card. Risers replace 1 PCl slot and 1 PCle slot on DT system board.

Graphics/Video Controller
MT supports full height card, DT supports low profile card or full height card with optional riser. SFF supports low profile card.
MT

Integrated Intel® Graphics Media
Accelerator 3100*

DT

SFF

USFF

Integrated on system board

Enhanced Graphic/Video Options
DVI (Digital)

Optional full height or low profile Add-2 card

Native DVI
Connector

* Significant memory may be used to support graphics, depending on system memory size and other factors.

version 1.0

15 15

Dell™ OptiPlex™ 755 technical guide

Graphics/Video Controller, CONT.
MT

DT

SFF

USFF

SFF

USFF

Enhanced Graphic/Video Options , Cont.
128MB ATI Radeon X1300* with DVI and
TV Out

Optional full height or low profile card

256MB ATI Radeon HD 2400 PRO* with
DVI and TV Out

Optional full height or low profile card

256MB ATI Radeon™ HD 2400 XT* Dual
Monitor with VGA cable and TV Out

Optional full height or low profile card

256MB ATI Radeon™ HD 2400 XT* Dual
Monitor with DVI and VGA cables and TV Out

Optional full height or low profile card

™

* Significant system memory may be used to support graphics, depending on system memory size and other factors.

Integrated Intel Graphics
Media Accelerator 3100*

MT

DT

Bus Type
GPU Core Clock
Frame Buffer Memory Size

Integrated
350 MHz Integrated 24 bit RAMDAC
Up to 256MB of shared system memory*

Maximum Power Consumption

9.63 W

Overlay Planes

Yes

Maximum Color Depth

32 bit

Maximum Vertical Refresh Rate

85 Hz

Multiple Display Support
Operating Systems Graphics/ Video API Support
Supported Resolutions and Max Refresh Rates
(Hz) (Note: analog and/or digital)
External Connectors

Yes, with optional DVI Add-2 card
OpenGL® 1.4/DirectX 9.0c
Up to 2048x1566 @ 75 Hz
Supports flat panels up to 1920x1200 @ 60 Hz or
digital CRT/HDTV at 1400x1050 @ 85 Hz
VGA

Dimensions inches/centimeters (L x H)

DVI
N/A

Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Altitude Range

0° to 106° C (32° to 223° F)
20% to 80% (non-condensing)
–15.2 to 3048 m (–50 to 10,000 ft)

* Significant system memory may be used to support graphics, depending on system memory size and other factors.

version 1.0

16 16

Dell™ OptiPlex™ 755 technical guide

DVI (Digital) add-2 card

MT

DT

Bus Type
Maximum Supported Resolution

SFF

USFF

sDVO
Up to 2048x1566 @ 75 Hz
Supports flat panels up to 1920x1200 @ 60 Hz or digital CRT/
HDTV at 1400x1050 @ 85 Hz

Dimensions of Full Height Card

5.75x2.75in/
14.61x6.99cm

inches/centimeters (L x H)

Dimensions of Low Profile Card

5.75x2.75in/
14.61x6.99cm

inches/centimeters (L x H)

Maximum Power Consumption
External Connectors

128MB ATI Radeon X1300
with DVI and TV Out

DVI

MT

DT

Bus Type

PCIEx16

GPU Core Clock

400Mhz

Frame Buffer Memory (onboard) Size and Speed

20W

Overlay Planes

Yes

Maximum Color Depth

32-bit

Maximum Vertical Refresh Rate

85Hz

Operating Systems Graphics/ Video API Support
Supported Resolutions and Max Refresh Rates
(Hz) (Note: analog and/or digital)
External Connectors
Dimensions of Full Height Card
inches/centimeters (L x H)

Dimensions of Low Profile Card
inches/centimeters (L x H)

USFF

128MB 400Mhz

Maximum Power Consumption

Multiple Display Support

SFF

No
D3D and Open GL®
Max : 1920x1440/32bpp @ 75Hz
Min : 640x480/8bpp @ 60Hz
DVI-D and S-video with Composite
6.6x4.72in/167.64x120mm
6.6x3.35in/167.64x85mm

Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Altitude Range

version 1.0

50°-122°F (10°-50° C)
5-90% RH (non-condensing)
0-20,000 ft.

17 17

Dell™ OptiPlex™ 755 technical guide

Graphics/Video Controller, cont.
256MB ATI Radeon™ HD 2400 PRO
with DVI and TV Out

MT

DT

Bus Type

PCIEx16

GPU Core Clock

400MHz

Frame Buffer Memory (onboard) Size and Speed

21W

Overlay Planes

Yes

Maximum Color Depth

32-bit

Maximum Vertical Refresh Rate

85Hz

Operating Systems Graphics/ Video API Support
Supported Resolutions and Max Refresh Rates
(Hz) (Note: analog and/or digital)
External Connectors
Dimensions of Full Height Card
inches/centimeters (L x H)

Dimensions of Low Profile Card
inches/centimeters (L x H)

USFF

256MB 500Mhz

Maximum Power Consumption

Multiple Display Support

SFF

No
D3D and Open GL
Max : 1920x1440/32bpp @ 75Hz
Min : 640x480/8bpp @ 60Hz
DVI-D and S-video
6.6x4.72in/167.64x120mm
6.6x3.35in/167.64x85mm

Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Altitude Range

version 1.0

50°-122°F (10°-50° C)
5-90% RH (non-condensing)
0-20,000 ft.

18 18

Dell™ OptiPlex™ 755 technical guide

Graphics/Video Controller, cont.
256MB ATI Radeon™ HD 2400 XT Dual
Monitor with DVI/VGA via cables
and TV Out

MT

DT

Bus Type

PCIEx16

GPU Core Clock

600Mhz

Frame Buffer Memory (onboard) Size and Speed

25W

Overlay Planes

Yes

Maximum Color Depth

32-bit

Maximum Vertical Refresh Rate

85Hz

Operating Systems Graphics/ Video API Support
Supported Resolutions and Max Refresh Rates
(Hz) (Note: analog and/or digital)
External Connectors
Dimensions of Full Height Card
inches/centimeters (L x H)

Dimensions of Low Profile Card
inches/centimeters (L x H)

USFF

256MB 500Mhz

Maximum Power Consumption

Multiple Display Support

SFF

2
D3D, Open GL
Max : 1920x1440/32bpp @ 75Hz
Min : 640x480/8bpp @ 60Hz
DMS-59
6.6x4.72in/167.64x120mm
6.6x3.35in/167.64x85mm

Environmental Operating Conditions for Graphics Cards:
Operating Temperature Range
Relative Humidity Range
Altitude Range

version 1.0

50°-122°F (10°-50° C)
5-90% RH (non-condensing)
0-20,000 ft.

19 19

Dell™ OptiPlex™ 755 technical guide

External Ports/Connectors
MT supports full height cards, DT supports low profile cards or full height cards with optional riser. SFF supports low profile cards.
See chassis diagrams section for
port/connector locations
USB 2.0 (totals)

MT

DT

SFF

USFF

10

7

Front

2

2

Back

6

5

Internal

2

0

Serial

One rear

PS/2 and 1 additional Serial

Optional full height or low profile bracket

eSATA Bracket

Optional full height or low profile bracket

(low profile bracket includes PS/2 dongle)

Parallel

One rear

Network Connector (RJ-45)

One rear

1394 Controller

Optional full height or low profile card

Video:
VGA

One rear

DVI

Optional full height or low profile Add-2 card

One rear

Audio:
Microphone-in

One minijack front

Headphone

One minijack front

Stereo line-in

One minijack front

Speakers line out

One minijack rear

Risers:

(replaces 1 PCI slot and 1 PCIe slot on DT system board)

version 1.0

Combo full height riser with 1 PCI and
1 PCIe connector

✓

Dual full height riser with 2 PCI connectors

✓

20 20

Dell™ OptiPlex™ 755 technical guide

Communications - Network Adapter (NIC)
MT supports full height card, DT supports low profile card or full height card with optional riser. SFF supports low profile card.
MT

DT

Intel® 82566DM Gigabit LAN 10/100/1000

USFF

Integrated on system board

(Remote Wake Up, PXE, and Intel Active Management
Technology support)

Broadcom NetXtreme 10/100/1000 PCIe
Gigabit Networking Card

SFF

Supports
full height

Low profile
card or full
height card with
optional riser

Supports low
profile card

Integrated Intel 82566DM Gigabit LAN

External Connector Type

RJ45

Data Rates Supported

10/100/1000 Mbps

Controller Details
Controller bus architecture

Intel Gigabit LAN Connect Interface (GLCI) and LAN Connect Interface (LCI)

Integrated memory

N/A

Data transfer mode

N/A

Power consumption

1000 Mbps: 2468 mW
100 Mbps: 772 mW
10 Mbps: 607 mW

(full operation per data rate connection speed)

No Link (no wake): 40 mW
10 Mbps Idle (wake): 271 mW
100 Mbps Idle (wake): 756 mW

Power consumption (standby operation)
IEEE Standards Compliance

802.3ab

Hardware Certifications

N/A

Boot ROM Support

EEPROM (located in SPI)

Network Transfer Mode
Network Transfer Rate
10BASE-T (full-duplex) 20 Mbps
100BASE-TX (half-duplex) 100 Mbps
100BASE-TX (full-duplex) 200 Mbps
1000BASE-T (full-duplex) 2000 Mbps

Full duplex at 10, 100, or 1000 Mbps and
half duplex at 10 or 100 Mbps.

Environmental
Operating temperature

0° C to 70° C (32° F to 158° F)

Operating humidity
Operating System Driver Support
Manageability
Management Capabilities Alerting

version 1.0

20% to 80% (non-condensing)
Windows XP, Windows Vista® Ultimate, Windows Vista® Business 32 bit/64 bit,
Windows Vista Home Basic, Linux
®

WOL, PXE
ASF2.0, AMT 3.0

21 21

Dell™ OptiPlex™ 755 technical guide

Communications - Network Adapter (NIC), cont.
Broadcom NetXtreme 10/100/1000
PCIe Gigabit Networking Card

Connector Type
Data Rates Supported

MT

DT

SFF

USFF

RJ-45
10/100/1000 Mbps Half/full duplex

Controller Details
Controller bus architecture

PCIe c1.0a x1

Integrated memory

64KBytes RX, 8KBytes TX

Data transfer mode

Bus-Master DMA

Power consumption

2.84W (860mA @ +3.3V)

(full operation per data rate connection speed)

Power consumption (standby operation)
IEEE Standards Compliance
Hardware Certifications
Boot ROM Support
Network Transfer Mode

Network Transfer Rate

Less than 300mW
802.3, 802.2, 802.3x, 802.1p
FCC B, VCCI B, CE
No
Full Duplex/Half Dup[lex
10BASE-T (full-duplex) 20 Mbps Max*
100BASE-TX (half-duplex) 100 Mbps Max*
100BASE-TX (full-duplex) 200 MbpsMax*
1000BASE-T (full-duplex) 2000 Mbps Max*
* Depends on the system environment.

Environmental
Operating temperature

0° C to 55° C (32° F - 131° F)

Operating humidity

5% ~ 85% (non-condensing)

Operating System Driver Support
Manageability
Management Capabilities Alerting

version 1.0

Windows® XP, Windows Vista® Ultimate, Windows Vista®
Business 32 bit/64 bit, Windows Vista Home Basic, Linux
WOL, PXE2.1, ACPI
None

22 22

Dell™ OptiPlex™ 755 technical guide

Communications – Modem
MT supports full height card, DT supports low profile card or full height card with optional riser. SFF supports low profile card.
MT
V.92 Data/Fax
Controllerless Modem

Bus

SFF

Low profile
card or full
height card with
optional riser

Supports low
profile card

External Connector

RJ-11

Data Transmission

PCM - Pulse Coded Modulation (V.92/V.90)
TCM - Trellis Coded Modulation (V.90/V.34/V.32 bis/V.32)

Data Speeds

56kbps receive, 48kbps transmit

Data Standards

ITU V.92/V.90, V.34/V.32 bis/V.32
14.4kbps

Fax Mode Capabilities
Error Correction and Data Compression
Power Management
Upgradeability

2-wire, half-duplex, synchronous
V.44, V.42, V.42bis, MNP 2-4, MNP 5
WOR (wake on ring) capable
Driver upgradeable
V.80 Synchronous Access Mode (SAM) can be
supported by software applications (not driver)

Video
Operating Temperature

0° C-50° C (32° F-122° F)

Operating Humidity

45° C (113° F) 90% max

Operating System Support

Vista 32/64, Windows XP 32/64

Operating System Driver Support

Vista 32/64, Windows XP 32/64

Power Requirements
Chipset

+3.0V~+3.6V, 116.6mW max
Conexant SmartHSFs/LF (CX11256 & CX20493)

Dimensions of Full Height Card
inches/centimeters

USFF

PCI

Fax Speeds

(L X H)

Dimensions of Low Profile Card
inches/centimeters (L X H)

version 1.0

Supports
full height

DT

L: 5.25in/13.325cm H: 4.73in/12.002cm
L: 5.26in/13.366cm H: 3.12in/7.923cm

23 23

Dell™ OptiPlex™ 755 technical guide

Audio and Speakers
MT

ADI 1984 High Definition Audio

DT

SFF

USFF

Integrated on system board

Internal Chassis Speaker

Optional

Dell A225 Speakers

Optional

Dell A525 Speakers

Optional

Dell AS501 Flat Panel Speakers (Sound Bar)

Optional

Dell AS501PA Flat Panel Speakers (Sound Bar)

Optional

Keyboard and Mouse
MT

DT

Dell USB Entry QuietKey Keyboard

Optional

Dell USB Enhanced Multimedia Keyboard

Optional

Dell Smart Card USB Keyboard

Optional

Dell Bluetooth Keyboard and Mouse

Optional

Dell USB Entry 2-Button Scroll Mouse

Optional

Dell USB Optical 2-Button Scroll Mouse

Optional

Dell USB Premium 5-Button Mouse

Optional

Dell Palmrest

Optional

Dell Logo Mouse Pad

Optional

SFF

USFF

SFF

USFF

Security
MT

Trusted Platform Module (TPM) 1.2

version 1.0

DT

Integrated on system board

Chassis Intrusion Switch

Optional

Dell USB External Biometric Fingerprint Reader

Optional

Chassis Lock Slot

Standard

24 24

Dell™ OptiPlex™ 755 technical guide

Service and Support
For more details on Dell Service Plans please to go to www.dell.com/service/service_plans/
MT

DT

SFF

3-Year Limited Warranty1 (3-3-0)

Standard

3-Year Next Business Day On-site2 Service
(3-3-3)

Optional

Gold Tech Support

Optional

USFF

1

For a copy of limited warranty, write Dell USA L.P., Attn: Warranties, One Dell Way, Round Rock, TX 78682 or visit www.dell.com/warranty.

2

May be provided by third-party. Technician dispatched, if necessary, following phone-based troubleshooting. Availability varies. See dell.com/servicecontracts for details.

Software
MT

version 1.0

DT

SFF

Dell Client Manager Standard

Available via Dell.com

Wave EMBASSY® Trust Suite

Standard

Norton Internet Security

90-Day Trial or Optional Subscription

McAfee Security Center

90-Day Trial or Optional Subscription

USFF

25 25

Dell™ OptiPlex™ 755 technical guide

Detailed Engineering Specifications
system dimensions (physical)
System Weight1 and Shipping Weight1 is based on a typical configuration and may vary based on PC configuration. A typical configuration
includes: integrated graphics, one hard drive, one optical drive, and one diskette drive.
MT

DT

SFF

USFF

33.0

16.0

10.7

6.0

25.8 / 11.70

18.2 / 8.26

15 / 6.80

10 / 4.54

Height inches/centimeters

16.3 / 41.4

4.5 / 11.4

3.65 / 9.26

10.3 / 26.4

Width inches/centimeters

7.3 / 18.5

15.7 / 39.9

12.4 / 31.4

3.5 / 8.9

Depth inches/centimeters

17.3 / 43.9

13.9 / 35.3

13.4 / 34

9.9 / 25.3

43.5 / 19.73

28 / 12.7

21.3 / 9.66

26.1 / 11.84

Height inches/centimeters

22.38 / 56.85

20.63 / 52.4

20.88 / 50.04

19.88 / 50.5

Width inches/centimeters

22.25 / 56.52

20.31 / 51.59

19.38 / 49.23

17.5 / 44.45

Depth inches/centimeters

14.25 / 36.2

11.75 / 29.85

10.63 / 27

10.44 / 26.52

Chassis Volume liters
Chassis Weight1 pounds/kilograms
Chassis Dimensions: (HxWxD)

Shipping Weight pounds/kilograms
(includes packaging materials)
1

Packaging Parameters (HxWxD)2

1

Weights are approximates and may change based on system configuration and included accessories.

2

Dimensions are DAO specific. Each region has unique packing.

version 1.0

26 26

Dell™ OptiPlex™ 755 technical guide

System Level Environmental and Operating Conditions
MT

DT

SFF

USFF

Temperature
Operating
Non-Operating (Storage)
Relative Humidity

10° to 35° C (50° to 95° F)
-40° to 65° C (-40° to -149° F)
20% to 80% (non-condensing)

Maximum Vibration
Operating
Non-Operating (Storage)

0.25 G at 3 to 200 Hz at 0.5 octave/min
0.5 G at 3 to 200 Hz at 1 octave/min

Maximum Shock
Operating

Bottom half-sine pulse with a change in velocity of 50.8 cm/sec (20 inches/sec)

Non-Operating (Storage)

27-G faired square wave with a velocity change of 508 cm/sec (200 inches/sec)

Maximum Altitude

version 1.0

Operating

–15.2 to 3,048 m (–50 to 10,000 ft)

Non-Operating (Storage)

–15.2 to 10,668 m (–50 to 35,000 ft)

27 27

Dell™ OptiPlex™ 755 technical guide

Power
MT

DT

SFF

USFF

305W

305W
High
Efficiency

280W

280W
High
Efficiency

275W

275W
High
Efficiency

220W High Efficiency
External PSU

AC Input Voltage Range

90-135A/
180264A

90-264A

90-135A/
180264A

90-264A

90-135A/
180264A

90-264A

90-264A

AC Input Current

9.0A/4.5A

4.5A/2.3A

9.0A/4.5A

4.5A/2.3A

8.8A/4.3A

4.3A/2.2A

3.2A/1.7A

AC Input Frequency

50/60Hz

50/60Hz

50/60Hz

50/60Hz

50/60Hz

50/60Hz

50/60Hz

AC Holdup Time

16ms

16ms

16ms

16ms

16ms

16ms

10ms at 100% load

Minimum Efficiency

65%

80%

65%

80%

65%

80%

85%

Power Supply Wattage

(low ac range/high AC range)

(50% load)

Energy Star 4.0
Compliant Power Supply

✓

✓

✓

✓

PFC (Active)

✓

✓

✓

✓

DC Parameters
+3.3v Output

17.0A

17.0A

10.0A

10.0A

5.0A

5.0A

+5.0v Output

22.0A

22.0A

15.0A

15.0A

18.0A

18.0A

+12.0v Output

18.0+18.0A

18.0+18.0A

16.0A

16.0A

17.0A

17.0A

+5.0v Auxiliary Output

4.0A

4.0A

4.0A

4.0A

4.0A

4.0A

-12.0v Output

1.0A

1.0A

0.5A

0.5A

0.5A

0.5A

Max Total Power

305W

305W

280W

280W

275W

275W

Max Combined
+3.3v / +5.0v Power

150W

150W

108W

108W

106W

106W

Max Combined
12.0v Power

264W

264W

N/A

N/A

N/A

N/A

BTUs/h

1600

1300

1468

1195

1444

1171

(based on PSU max wattage)

3.3v CMOS Battery

220W

880

3-V CR2032 lithium coin cell. Est. 5-year life

(type and estimated battery life)

RTC accuracy

Drift 2 seconds per month

(time of day)

Power Supply Fan

18.0A

Sleeve
bearing

Sleeve
bearing

Sleeve
bearing

Sleeve
bearing

Ball
bearing

Ball
bearing

None

Y

N

Y

N

Y

Y

Power Supply Meets Requirements of:
Energy Star 4.0
Compliant Power Supply

version 1.0

N

28 28

Dell™ OptiPlex™ 755 technical guide

Power, CONT.
MT

DT

SFF

USFF

Blue Angel Compliant

N

Y

N

Y

N

Y

Y

UL Certified

✓

✓

✓

✓

✓

✓

✓

FEMP Executive
Order 13221

N

Y

N

Y

N

Y

Y

Audio
Integrated ADI 1984
High Definition Audio

MT

DT

SFF

USFF

High Definition Stereo Support

✓

✓

✓

✓

Number of Channels

2

Number of Bits / Audio Resolution

16, 20, and 24-bit resolution

Sampling Rate (recording/playback)

Independent 8, 11.025, 16, 22.05, 32, 44.1,
48, 88.2, 96, 176.4, and 192 kHz sample rates

Signal to Noise Ratio

96+ dB audio outputs, 90+ dB audio inputs

Wavetable Voices
Analog Audio

✓

✓

✓

✓

Dolby Digital
THX
Digital Out (S/PDIF)
Audio Jack Impedance
Microphone

150 kΩ

Line-In

150 kΩ

Line-Out

190 kΩ

Headphone
Internal Speaker Power Rating

version 1.0

.5 Ω
2 Watts

29 29

Dell™ OptiPlex™ 755 technical guide

hard drives
80GB SATA 10000 RPM HDD1

Capacity (bytes)

MT

DT

SFF

USFF

80,026,361,856

Dimensions inches (W x D x H)

5.87 x 4 x 1

Interface Type and Maximum Speed

Up to 3Gb/s

Internal Buffer Size (range)

16MB

Average Seek Time

4.6 ms

Rotational Speed

10000 rpm

Logical Blocks

156,301,488

Power Source
DC Power (Max)

Idle 7.0W, Active 10.0W

DC Current

5V (.8A) and 12V (1.8A)

Environmental Operating Conditions:
Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range

41°F to 140°F (5°C to 60°C)
20% to 80% non-condensing
84°F (29°C)
-50 ft to 10000 ft

Environmental Non-Operating Conditions:
Temperature Range

-40°F to 149°F (-40°C to 65°C)

Relative Humidity Range

10% to 90% non-condensing

Maximum Wet Bulb Temperature
Altitude Range
1

100.4°F (38°C)
-50 ft to 35000 ft

For hard drives, GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity varies with preloaded material and operating environment and will be less.

version 1.0

30 30

Dell™ OptiPlex™ 755 technical guide

hard drives, cont.
80GB SATA 7200 RPM HDD1

Capacity (bytes)

MT

DT

SFF

80,026,361,856

Dimensions inches (W x D x H)

5.87 x 4 x 1

Interface Type and Maximum Speed

Up to 3Gb/s

Internal Buffer Size (range)

8MB

Average Seek Time

8.5 ms

Rotational Speed
Logical Blocks

USFF

7200 rpm
156,301,488

Power Source
DC Power (Max)

Idle 7.0W, Active 10.0W

DC Current

5V (.8A) and 12V (1.8A)

Environmental Operating Conditions:
Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range

41°F to 140°F (5°C to 60°C)
20% to 80% non-condensing
84°F (29°C)
-50 ft to 10000 ft

Environmental Non-Operating Conditions:
Temperature Range

-40°F to 149°F (-40°C to 65°C)

Relative Humidity Range

10% to 90% non-condensing

Maximum Wet Bulb Temperature
Altitude Range
1

100.4°F (38°C)
-50 ft to 35000 ft

For hard drives, GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity varies with preloaded material and operating environment and will be less.

version 1.0

31 31

Dell™ OptiPlex™ 755 technical guide

hard drives, cont.
160GB SATA 7200 RPM HDD1

Capacity (bytes)

MT

DT

SFF

160,041,885,696

Dimensions inches (W x D x H)

5.87 x 4 x 1

Interface Type and Maximum Speed

Up to 3Gb/s

Internal Buffer Size (range)

8MB

Average Seek Time

8.5 ms

Rotational Speed
Logical Blocks

USFF

7200 rpm
312,581,808

Power Source
DC Power (Max)

Idle 7.0W, Active 10.0W

DC Current

5V (.8A) and 12V (1.8A)

Environmental Operating Conditions:
Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range

41°F to 140°F (5°C to 60°C)
20% to 80% non-condensing
84°F (29°C)
-50 ft to 10000 ft

Environmental Non-Operating Conditions:
Temperature Range

-40°F to 149°F (-40°C to 65°C)

Relative Humidity Range

10% to 90% non-condensing

Maximum Wet Bulb Temperature
Altitude Range
1

100.4°F (38°C)
-50 ft to 35000 ft

For hard drives, GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity varies with preloaded material and operating environment and will be less.

version 1.0

32 32

Dell™ OptiPlex™ 755 technical guide

hard drives, cont.
250GB SATA 7200 RPM HDD1

Capacity (bytes)

MT

DT

SFF

250,059,350,016

Dimensions inches (W x D x H)

5.87 x 4 x 1

Interface Type and Maximum Speed

Up to 3Gb/s

Internal Buffer Size (range)
Average Seek Time
Rotational Speed
Logical Blocks

USFF

8-16MB
8.5 ms
7200 rpm
488,397,168

Power Source
DC Power (Max)

Idle 7.0W, Active 10.0W

DC Current

5V (.8A) and 12V (1.8A)

Environmental Operating Conditions:
Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range

41°F to 140°F (5°C to 60°C)
20% to 80% non-condensing
84°F (29°C)
-50 ft to 10000 ft

Environmental Non-Operating Conditions:
Temperature Range

-40°F to 149°F (-40°C to 65°C)

Relative Humidity Range

10% to 90% non-condensing

Maximum Wet Bulb Temperature
Altitude Range
1

100.4°F (38°C)
-50 ft to 35000 ft

For hard drives, GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity varies with preloaded material and operating environment and will be less.

version 1.0

33 33

Dell™ OptiPlex™ 755 technical guide

optical drives
DVD +/- RW

MT

DT

SFF

USFF

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

Weight (max) pounds/kilograms

800g

800g

180g

180g

Interface Type and Speed

SATA 16x

SATA 16x

PATA 8x or SATA
8x

PATA 8X

Disc Capacity

Standard

Standard

Standard

Standard

Internal Buffer Size

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Access Times (typical)

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Writes

16x DVD/48x CD

16x DVD/48x CD

8x DVD/ 24x CD

8x DVD/ 24x CD

Reads

16x DVD/48x CD

16x DVD/48x CD

8x DVD/ 24x CD

8x DVD/ 24x CD

12V

12V

5V

5V

1200mA (12V)/
900mA (5V)

1200mA (12V)/
900mA (5V)

1000mA

1000mA

5°C to 50°C

5°C to 50°C

5°C to 50°C

5°C to 50°C

20% to 80% RH

20% to 80% RH

20% to 80% RH

20% to 80% RH

29°C

29°C

29°C

29°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

Operating Temperature Range

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

Relative Humidity Range

5% to 95% RH

5% to 95% RH

5% to 95% RH

5% to 95% RH

38°C

38°C

38°C

38°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

External Dimensions inches/centimeters

(Of Actual Drive Without Bezel – W x H x D):

Maximum Data Transfer Rates

Power Source
DC Power Requirements
DC Current
Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range
Environmental Non-Operating Conditions:

Maximum Wet Bulb Temperature
Altitude Range

version 1.0

34 34

Dell™ OptiPlex™ 755 technical guide

optical drives, cont.
DVD-ROM

MT

DT

SFF

USFF

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

Weight (max) pounds/kilograms

750g

750g

175g

175g

Interface Type and Speed

SATA 48x

SATA 48x

PATA 24x or
SATA 24x

PATA 24x

Disc Capacity

Standard

Standard

Standard

Standard

Internal Buffer Size

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Access Times (typical)

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Writes

N/A

N/A

N/A

N/A

Reads

16x DVD/48x CD

16x DVD/48x CD

8x DVD/ 24x CD

8x DVD/ 24x CD

12V

12V

5V

5V

1200mA (12V)/
900mA (5V)

1200mA (12V)/
900mA (5V)

800mA

800mA

5°C to 50°C

5°C to 50°C

5°C to 50°C

5°C to 50°C

20% to 80% RH

20% to 80% RH

20% to 80% RH

20% to 80% RH

29°C

29°C

29°C

29°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

Operating Temperature Range

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

Relative Humidity Range

5% to 95% RH

5% to 95% RH

5% to 95% RH

5% to 95% RH

38°C

38°C

38°C

38°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

External Dimensions inches/centimeters

(Of Actual Drive Without Bezel – W x H x D):

Maximum Data Transfer Rates

Power Source
DC Power Requirements
DC Current
Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range
Environmental Non-Operating Conditions:

Maximum Wet Bulb Temperature
Altitude Range

version 1.0

35 35

Dell™ OptiPlex™ 755 technical guide

optical drives, cont.
Combo CD-RW

MT

DT

SFF

USFF

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

Weight (max) pounds/kilograms

750g

750g

175g

175g

Interface Type and Speed

SATA 48x

SATA 48x

PATA 24x or
SATA 24x

PATA 24x

Disc Capacity

Standard

Standard

Standard

Standard

Internal Buffer Size

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Access Times (typical)

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Writes

48x CD

48x CD

24x CD

24x CD

Reads

16x DVD/48x CD

16x DVD/48x CD

8x DVD/ 24x CD

8x DVD/ 24x CD

12V

12V

5V

5V

1200mA (12V)/
900mA (5V)

1200mA (12V)/
900mA (5V)

900mA

900mA

5°C to 50°C

5°C to 50°C

5°C to 50°C

5°C to 50°C

20% to 80% RH

20% to 80% RH

20% to 80% RH

20% to 80% RH

29°C

29°C

29°C

29°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

Operating Temperature Range

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

Relative Humidity Range

5% to 95% RH

5% to 95% RH

5% to 95% RH

5% to 95% RH

38°C

38°C

38°C

38°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

External Dimensions inches/centimeters

(Of Actual Drive Without Bezel – W x H x D):

Maximum Data Transfer Rates

Power Source
DC Power Requirements
DC Current
Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range
Environmental Non-Operating Conditions:

Maximum Wet Bulb Temperature
Altitude Range

version 1.0

36 36

Dell™ OptiPlex™ 755 technical guide

optical drives, cont.
CD-ROM

MT

DT

SFF

USFF

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

148.2mm(6in)/
42mm (2in)/ 190.5
(max)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

128.0 mm (5.04)/
12.7mm (0.5in)/
126.1mm (4.97in)

Weight (max) pounds/kilograms

750g

750g

157g

157g

Interface Type and Speed

SATA 48x

SATA 48x

PATA 24x

PATA 24x

Disc Capacity

Standard

Standard

Standard

Standard

Internal Buffer Size

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Access Times (typical)

Supplierdependent

Supplierdependent

Supplierdependent

Supplierdependent

Writes

N/A

N/A

N/A

N/A

Reads

48x CD

48x CD

24x CD

24x CD

12V

12V

5V

5V

1200mA (12V)/
900mA (5V)

1200mA (12V)/
900mA (5V)

800mA

800mA

5°C to 50°C

5°C to 50°C

5°C to 50°C

5°C to 50°C

20% to 80% RH

20% to 80% RH

20% to 80% RH

20% to 80% RH

29°C

29°C

29°C

29°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

Operating Temperature Range

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

-45°C to 65°C

Relative Humidity Range

5% to 95% RH

5% to 95% RH

5% to 95% RH

5% to 95% RH

38°C

38°C

38°C

38°C

-200 to 10600m

-200 to 10600m

-200 to 10600m

-200 to 10600m

External Dimensions inches/centimeters

(Of Actual Drive Without Bezel – W x H x D):

Maximum Data Transfer Rates

Power Source
DC Power Requirements
DC Current
Environmental Operating Conditions:
Operating Temperature Range
Relative Humidity Range
Maximum Wet Bulb Temperature
Altitude Range
Environmental Non-Operating Conditions:

Maximum Wet Bulb Temperature
Altitude Range

More details for optical drives can be found at: 							
http://support.dell.com/support/systemsinfo/documentation.aspx?c=us&l=en&s=gen&~cat=7

version 1.0

37 37

Dell™ OptiPlex™ 755 technical guide

BIOS Defaults
BIOS Factory Defaults (All chassis unless noted)
Feature Setting

Default Value
Drives

SATA-0:

Depends on chassis and HDDs installed

SATA-1:

Depends on chassis and HDDs installed

SATA-21:

Depends on chassis and HDDs installed

SATA-32:

Depends on chassis and HDDs installed

External SATA3,4:

On

SATA Operation:

RAID Autodetect/AHCI

SMART Reporting:

Off
onboard devices

Integrated NIC:

On

Integrated Audio:

On

USB Controller:

On

Rear Quad USB:

On

Rear Dual USB:

On

Front USB:

On

PCI Slots3:

On

LPT Port Mode:

PS/2

LPT Port Address:

378h

Serial Port #1:

Auto
video

Primary Video :
3

version 1.0

Auto

38 38

Dell™ OptiPlex™ 755 technical guide

BIOS Defaults, cont.
BIOS Factory Defaults (All chassis unless noted)
Feature Setting

Default Value
performance

Multiple CPU Core:

On

SpeedStep:

Off

Virtualization:

Off

VT for Direct I/O:

Off

Limit CPUID Value:

Off

HDD Acoustic Mode:

Bypass
security

version 1.0

Admin Password:

(none)

System Password:

(none)

SATA-0 Password:

(none)

SATA-1 Password:

(none)

SATA-2 Password1:

(none)

SATA-3 Password2:

(none)

External SATA Password3,4:

(none)

Password Changes:

Unlocked

TPM Security:

Off

Execute Disable:

On

Computrace®:

Deactivate

39 39

Dell™ OptiPlex™ 755 technical guide

BIOS Defaults, cont.
BIOS Factory Defaults (All chassis unless noted)
Feature Setting

Default Value
power management

AC Recovery:

Off

Auto Power On:

Off

Auto Power Time:

12:00 AM

Low Power Mode:

Off

Remote Wake Up:

Off

Suspend Mode:

S3
maintenance

Service Tag:

System specific

SERR Message:

On

Load Defaults:

Cancel

Event Log:

Mark All Entries
post behavior

Fast Boot:

On

Numlock Key:

On

POST Hotkeys:

Setup & Boot Menu

MEBx Hotkey:

On

Keyboard Errors:

Report

Not present on USFF or SFF
Only present on MT
3
Not present on USFF
4
External SATA option only becomes exposed if eSATA dongle is attached to eSATA port.
1
2

version 1.0

40 40

Dell™ OptiPlex™ 755 technical guide

Chassis Enclosure and Ventilation Requirements

Enclosure Ventilation

If your enclosure has doors, they need to be of a type that
allows at least 30% airflow through the enclosure (front and back).
Enclosure Minimum Clearance

Leave a 10.2 cm (4 in.) minimum clearance on all vented sides of
the computer to permit the airflow required for proper ventilation.

Recommended Enclosure

Do not install your computer in an enclosure that does not
allow airflow. This restricts the airflow and impacts your
computer’s performance, possibly causing it to overheat.

Open Desk Minimum Clearance

If your computer is installed in a corner, on a desk, or under
a desk, leave at least 5.1 cm (2 in.) clearance from the back
of the computer to the wall to permit the airflow required for
proper ventilation.

version 1.0

41 41

Dell™ OptiPlex™ 755 technical guide

Regulatory Compliance and Environmental
Product related conformity assessment and regulatory authorizations including Product Safety, Electromagnetic Compatibility (EMC),
Ergonomics, and Communication Devices relevant to this product may be viewed at www.dell.com/regulatory_compliance. The Regulatory
Datasheet for this product is located at: http://www.dell.com/content/topics/global.aspx/corp/environment/en/prod_datasheets
Details of Dell’s environmental stewardship program to conserve product energy consumption, reduce or eliminate materials for
disposal, prolong product life span and provide effective and convenient equipment recovery solutions may be viewed at www.dell.
com/environment. Product related conformity assessment, regulatory authorizations, and information encompassing Environmental,
Energy Consumption, Noise Emissions, Product Materials Information, Packaging, Batteries, and Recycling relevant to this product may
be viewed by clicking the Design for Environment link on the webpage.

Acoustic Noise Emission Information
Optiplex 755 MT
Component

Typical Configuration

High-end Configuration

CPU

E4500

E6850

Memory

1GB DDRII 667MHz

2GB DDRII 800MHz

HDD (#, capacity)

80GB 7200 RPM SATA

2 x 160GB 7200 RPM SATA

RMSD

DVD/CD-RW Combo

DVD/DVD+/-R

Graphics Adapter

Integrated Adapter

ATI 2400 Pro

The Declared Noise Emission in accordance with ISO 9296 for the Dell Optiplex 755 MT is as follows1: (all values LWAd expressed in
bels2 ; 1 bel=10 decibels, re 10-12 Watts).
Optiplex 755 MT
Operating Mode

Typical Configuration
Declared Sound Power (LWAd)

High-end Configuration
Declared Sound Power (LWAd)

Idle

3.7

3.8

HDD Operating

3.8

3.8

ODD Operating

5.0

5.0

90% CPU

3.7

4.1

1

All tests are conducted according to ISO 7779 and declared according to ISO 9296 except 90% CPU. For this mode, the system CPU was stressed at 90% utilization with no other
peripheral device actively seeking. This test mode is not specified in ISO 7779, but was measured using the same microphone distances and measurement techniques defined
for the other reported operating modes.

2

Declared Sound Power rounded to nearest tenth of a bel per ISO 9296 section 4.4.2

version 1.0

42 42

Dell™ OptiPlex™ 755 technical guide

Acoustic Noise Emission Information, cont.
The Declared A-weighted Sound Pressure Level in decibels (re 2x10-5 Pa), at Operator, Bystander, and Desk Side Positions are measured
in accordance with ISO 7779 7.6.1, 7.6.2, and C.15.2 and declared in accordance with ISO 9296 for this product is as follows1:
Optiplex 755 MT
Typical Configuration
Declared Sound Pressure (LpA)
Operating
Mode

1

High-end Configuration
Declared Sound Pressure (LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Idle

28

23

22

31

26

22

HDD Operating

29

24

22

31

26

22

ODD Operating

42

36

33

42

36

34

90% CPU

29

24

22

34

29

25

All tests are conducted according to ISO 7779 and declared according to ISO 9296 except 90% CPU. For this mode, the system CPU was stressed at 90% utilization with no other
peripheral device actively seeking. This test mode is not specified in ISO 7779, but was measured using the same microphone distances and measurement techniques defined
for the other reported operating modes.

version 1.0

43 43

Dell™ OptiPlex™ 755 technical guide

Acoustic Noise Emission Information, cont.
Optiplex 755 DT
Component

Typical Configuration

High-end Configuration

CPU

E4500

E6850

Memory

1GB DDRII 667MHz

2GB DDRII 800MHz

HDD (#, capacity)

80GB 7200 RPM SATA

80GB 10,000 RPM SATA

RMSD

DVD/CD-RW Combo

DVD/CD-RW Combo

Graphics Adapter

Integrated Adapter

ATI 2400 Pro

The Declared Noise Emission in accordance with ISO 9296 for the Dell Optiplex 755 DT is as follows3: (all values LWAd expressed in
bels4 ; 1 bel=10 decibels, re 10-12 Watts)
Optiplex 755 DT
Operating Mode

Typical Configuration
Declared Sound Power (LWAd)

High-end Configuration
Declared Sound Power (LWAd)

Idle

3.7

4.0

HDD Operating

3.8

4.1

ODD Operating

5.2

5.1

90% CPU

3.7

4.4

The Declared A-weighted Sound Pressure Level in decibels (re 2x10-5 Pa), at Operator, Bystander, and Desk Side Positions are measured
in accordance with ISO 7779 7.6.1, 7.6.2, and C.15.2 and declared in accordance with ISO 9296 for this product is as follows3:
Optiplex 755 DT
Typical Configuration
Declared Sound Pressure (LpA)
Operating Mode

High-end Configuration
Declared Sound Pressure (LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Idle

27

22

23

32

27

24

HDD Operating

28

23

23

33

28

25

ODD Operating

43

37

36

42

38

33

90% CPU

27

22

22

36

31

27

3

All tests are conducted according to ISO 7779 and declared according to ISO 9296 except 90% CPU. For this mode, the system CPU was stressed at 90% utilization with no
other peripheral device spinning. This test mode is not specified in ISO 7779, but was measured using the same microphone distances and measurement techniques defined
for the other reported operating modes.

4

Declared Sound Power rounded to nearest tenth of a bel per ISO 9296 section 4.4.2

version 1.0

44 44

Dell™ OptiPlex™ 755 technical guide

Acoustic Noise Emission Information, cont.
Optiplex 755 SFF
Component

Typical Configuration

High-end Configuration

CPU

E4500

E6850

Memory

1GB DDRII 667MHz

2GB DDRII 800MHz

HDD (#, capacity)

80GB 7200 RPM SATA

160GB 7200 RPM SATA

RMSD

DVD/CD-RW Combo

DVD/DVD+/-R

Graphics Adapter

Integrated Adapter

ATI 2400 Pro

The Declared Noise Emission in accordance with ISO 9296 for the Dell Optiplex 755 SFF is as follows5: (all values LWAd expressed in bels6 ; 1 bel=10 decibels,
re 10-12 Watts)
Optiplex 755 SFF
Operating Mode

Typical Configuration
Declared Sound Power (LWAd)

High-end Configuration
Declared Sound Power (LWAd)

Idle

4.0

4.3

HDD Operating

4.1

4.3

ODD Operating

5.0

5.2

90% CPU

4.1

4.5

The Declared A-weighted Sound Pressure Level in decibels (re 2x10-5 Pa), at Operator, Bystander, and Desk Side Positions are measured in accordance
with ISO 7779 7.6.1, 7.6.2, and C.15.2 and declared in accordance with ISO 9296 for this product is as follows5:
Optiplex 755 SFF
Typical Configuration
Declared Sound Pressure (LpA)
Operating Mode

High-end Configuration
Declared Sound Pressure (LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Operator
Position
(LpA)

Bystander
Position
(LpA)

DeskSide
Position
(LpA)

Idle

31

26

26

35

31

26

HDD Operating

31

26

26

35

31

26

ODD Operating

38

33

30

44

39

33

90% CPU

32

27

27

36

32

28

5

All tests are conducted according to ISO 7779 and declared according to ISO 9296 except 90% CPU. For this mode, the system CPU was stressed at 90% utilization with no
other peripheral device spinning. This test mode is not specified in ISO 7779, but was measured using the same microphone distances and measurement techniques defined
for the other reported operating modes.

6

Declared Sound Power rounded to nearest tenth of a bel per ISO 9296 section 4.4.2

version 1.0

45 45