Technical Guide
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TABLE OF CONTENTS OVERVIEW Mini Tower Computer (MT) View Desktop Computer (DT) View Small Form Factor Computer (SFF) View MARKETING SYSTEM CONFIGURATIONS Operating System, Chipset Processor Memory Hard Drives, Removable Storage, System Expansion Slots Graphics/Video Controller, External Ports/Connectors Communications-Network Adapter (...
TABLE OF CONTENTS OVERVIEW Mini Tower Computer (MT) View Desktop Computer (DT) View Small Form Factor Computer (SFF) View MARKETING SYSTEM CONFIGURATIONS Operating System, Chipset Processor Memory Hard Drives, Removable Storage, System Expansion Slots Graphics/Video Controller, External Ports/Connectors Communications-Network Adapter (...
Technical Guide
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SMALL FORM FACTOR COMPUTER (SFF) VIEW 1 2 3 9 10 11 12 13 4 56 7 8 14 15 FRONT VIEW 1 Optical Drive 5 Microphone Connector 2 Optical Drive Eject Button 6 Headphone Connector 3 Power Button, Power Light 4 USB 2.0 ...
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SMALL FORM FACTOR COMPUTER (SFF) VIEW 1 2 3 9 10 11 12 13 4 56 7 8 14 15 FRONT VIEW 1 Optical Drive 5 Microphone Connector 2 Optical Drive Eject Button 6 Headphone Connector 3 Power Button, Power Light 4 USB 2.0 ...
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...32 bits), Windows Vista® Business SP2 (32 and 64 bit), Windows Vista® Ultimate SP2 (32 bit) Basic Driver support only via Dell.com FreeDOS for (N-series), Ubuntu® Linux version 10.10 (China only) X X X CHIPSET Chipset Non-volatile memory on chipset BIOS ...DT SFF Intel H61 Express Chipset 32Mbit (4MB) located at SPI_FLASH on chipset LOM configuration contained within SPI_FLASH - For more information regarding the configuration of your computer, click Start>Help and Support and select the option to view information about your computer. DELL™ OPTIPLEX™ 390 ...
...32 bits), Windows Vista® Business SP2 (32 and 64 bit), Windows Vista® Ultimate SP2 (32 bit) Basic Driver support only via Dell.com FreeDOS for (N-series), Ubuntu® Linux version 10.10 (China only) X X X CHIPSET Chipset Non-volatile memory on chipset BIOS ...DT SFF Intel H61 Express Chipset 32Mbit (4MB) located at SPI_FLASH on chipset LOM configuration contained within SPI_FLASH - For more information regarding the configuration of your computer, click Start>Help and Support and select the option to view information about your computer. DELL™ OPTIPLEX™ 390 ...
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... availability subject to Dell customers. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL PROCESSOR NOTE: Global Standard Products (GSP) are a subset of Dell's relationship products that... are not a measure of configurations managed on a worldwide basis. The following GSP processors identified below will be made available to change and may vary by locking in specific product configurations worldwide. MT DT SFF...
... availability subject to Dell customers. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL PROCESSOR NOTE: Global Standard Products (GSP) are a subset of Dell's relationship products that... are not a measure of configurations managed on a worldwide basis. The following GSP processors identified below will be made available to change and may vary by locking in specific product configurations worldwide. MT DT SFF...
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... Non-ECC Memory DIMM Slots DIMM Capacities Minimum Memory Maximum System Memory MT 2 Up to 4GB 1GB 8GB1 DT 1333MHz 2 Up to 4GB 1GB 8GB1 SFF 2 Up to 4GB 1GB 8GB1 Memory configurations 8GB1 DDR3, 1333MHz, (2 DIMM) 4GB1 DDR3, 1333MHz, (1 DIMM) X X X X X X 3GB DDR3, ... DIMM) X X X X X X X X X 1 The total amount of available memory will continue to operate, but with a slight reduction in performance. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL MEMORY NOTE: Memory modules should be less than 4GB. To fully utilize 4GB or more of matched memory size, speed, and...
... Non-ECC Memory DIMM Slots DIMM Capacities Minimum Memory Maximum System Memory MT 2 Up to 4GB 1GB 8GB1 DT 1333MHz 2 Up to 4GB 1GB 8GB1 SFF 2 Up to 4GB 1GB 8GB1 Memory configurations 8GB1 DDR3, 1333MHz, (2 DIMM) 4GB1 DDR3, 1333MHz, (1 DIMM) X X X X X X 3GB DDR3, ... DIMM) X X X X X X X X X 1 The total amount of available memory will continue to operate, but with a slight reduction in performance. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL MEMORY NOTE: Memory modules should be less than 4GB. To fully utilize 4GB or more of matched memory size, speed, and...
Technical Guide
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...card dimensions. PCIe x1: USB 3.0, Serial, Parallel/Serial, NIC, Wireless MT DT SFF PCIe x16 Slot 1 1 1 PCIe x1 Slot Serial ATA (SATA) connectors 3 3 1 4 4 2 12 DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL HARD DRIVES MT Bays: 5.25-inch Optical Bay Supported (External... SATA 7200 RPM HDD X 320GB1 SATA 7200 RPM HDD X 250GB1 SATA 7200 RPM HDD X DT SFF 1 1 1 1 (slim-line) 1 1 1 1 4 2 X X X X X X X X REMOVABLE STORAGE Optical Drive: (SFF require slim-line optical drive) DVD+/-RW2 SATA 1.5Gbit/s DVD-ROM3 SATA 1.5Gbit/s Media Card Reader...
...card dimensions. PCIe x1: USB 3.0, Serial, Parallel/Serial, NIC, Wireless MT DT SFF PCIe x16 Slot 1 1 1 PCIe x1 Slot Serial ATA (SATA) connectors 3 3 1 4 4 2 12 DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL HARD DRIVES MT Bays: 5.25-inch Optical Bay Supported (External... SATA 7200 RPM HDD X 320GB1 SATA 7200 RPM HDD X 250GB1 SATA 7200 RPM HDD X DT SFF 1 1 1 1 (slim-line) 1 1 1 1 4 2 X X X X X X X X REMOVABLE STORAGE Optical Drive: (SFF require slim-line optical drive) DVD+/-RW2 SATA 1.5Gbit/s DVD-ROM3 SATA 1.5Gbit/s Media Card Reader...
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. See chassis diagrams section for headphones or speakers MT Optional FH card Optional FH card Optional FH card DT SFF 2 Front, 6 Rear Optional...Pentium class CPU-GPU combo] Intel HD Graphics 2000[with iCore Dual/Quad core class CPUGPU combo] Enhanced Graphic/Video Options MT DT SFF Integrated on MT and DT) Parallel and Serial via optional PCIex1 card Serial and PS/2 via optional dongle Network Connector (RJ-45)...
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. See chassis diagrams section for headphones or speakers MT Optional FH card Optional FH card Optional FH card DT SFF 2 Front, 6 Rear Optional...Pentium class CPU-GPU combo] Intel HD Graphics 2000[with iCore Dual/Quad core class CPUGPU combo] Enhanced Graphic/Video Options MT DT SFF Integrated on MT and DT) Parallel and Serial via optional PCIex1 card Serial and PS/2 via optional dongle Network Connector (RJ-45)...
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... Card Optional card 1 This term does not connote an actual operating speed of 1 Gb/sec. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - MT DT SFF Integrated Realtek LOM Integrated on system board Optional Optional Optional MT DT SFF Optional Optional Optional Optional 14 For high speed transmission, connection to a Gigabit Ethernet server and...
... Card Optional card 1 This term does not connote an actual operating speed of 1 Gb/sec. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - MT DT SFF Integrated Realtek LOM Integrated on system board Optional Optional Optional MT DT SFF Optional Optional Optional Optional 14 For high speed transmission, connection to a Gigabit Ethernet server and...
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SECURITY Chassis Intrusion Switch Chassis lock slot and loop support MT DT SFF Optional Standard SERVICE AND SUPPORT NOTE: For more information, visit www.dell.com/warranty. 2 Service may be dispatched if necessary following phone-based troubleshooting. Technician will be provided by third-party. only. SOFTWARE Dell Client Manager...
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SECURITY Chassis Intrusion Switch Chassis lock slot and loop support MT DT SFF Optional Standard SERVICE AND SUPPORT NOTE: For more information, visit www.dell.com/warranty. 2 Service may be dispatched if necessary following phone-based troubleshooting. Technician will be provided by third-party. only. SOFTWARE Dell Client Manager...
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...* 75W 3 4.376 / 11.115 7.4 / 24.13* 25W DT 1 2.731 /6.89 6.6 /16.765 25W 3 2.731 / 6.89 6.6 /16.765 10W SFF 1 2.731 /6.89 6.6/16.765 25W 1 2.731 / 6.89 6.6 /16.765 10W * Card length can be longer than standard Half-Length Card but cannot be a...Depth (inches/centimeters) Shipping Weight (pounds/kilograms - A typical configuration includes: integrated graphics, one hard drive, one optical drive. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL DETAILED ENGINEERING SPECIFICATIONS SYSTEM DIMENSIONS (PHYSICAL) NOTE: System Weight and Shipping Weight is based on a typical configuration...
...* 75W 3 4.376 / 11.115 7.4 / 24.13* 25W DT 1 2.731 /6.89 6.6 /16.765 25W 3 2.731 / 6.89 6.6 /16.765 10W SFF 1 2.731 /6.89 6.6/16.765 25W 1 2.731 / 6.89 6.6 /16.765 10W * Card length can be longer than standard Half-Length Card but cannot be a...Depth (inches/centimeters) Shipping Weight (pounds/kilograms - A typical configuration includes: integrated graphics, one hard drive, one optical drive. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL DETAILED ENGINEERING SPECIFICATIONS SYSTEM DIMENSIONS (PHYSICAL) NOTE: System Weight and Shipping Weight is based on a typical configuration...
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SYSTEM LEVEL ENVIRONMENTAL AND OPERATING CONDITIONS Temperature MT DT SFF Operating 10° to 35° C (50° to 95° F) Non-Operating (Storage) -40° to 65° C (-40° to 149° F) Relative ...
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL SYSTEM LEVEL ENVIRONMENTAL AND OPERATING CONDITIONS Temperature MT DT SFF Operating 10° to 35° C (50° to 95° F) Non-Operating (Storage) -40° to 65° C (-40° to 149° F) Relative ...
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...- 264Vac 4.4A / 2.2A 47HZ/63HZ 16MSEC 65% 4.4A / 2.2A 47HZ/63HZ 16MSEC 87 - 90 - 87% @ 20 - 50 - 100% load 7.0 A 15A 7.0 A 15A 240W SFF APFC EPA 240W High Efficiency 90 - 264Vac 90 - 264Vac 4.0A / 2.0A 47HZ/63HZ 16MSEC 65% 4.0A / 2.0A 47HZ/63HZ 16MSEC 87 - 90 - 87% @ 20 - 50... combined +3.3v / +5.0v power Max combined 12.0v power (note: only if more efficient Active Power Factor Correction (APFC) power supply. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL POWER NOTE: These form factors utilize a more than one 12v rail) BTUs/h (based on Sine Wave output for APFC PSUs...
...- 264Vac 4.4A / 2.2A 47HZ/63HZ 16MSEC 65% 4.4A / 2.2A 47HZ/63HZ 16MSEC 87 - 90 - 87% @ 20 - 50 - 100% load 7.0 A 15A 7.0 A 15A 240W SFF APFC EPA 240W High Efficiency 90 - 264Vac 90 - 264Vac 4.0A / 2.0A 47HZ/63HZ 16MSEC 65% 4.0A / 2.0A 47HZ/63HZ 16MSEC 87 - 90 - 87% @ 20 - 50... combined +3.3v / +5.0v power Max combined 12.0v power (note: only if more efficient Active Power Factor Correction (APFC) power supply. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL POWER NOTE: These form factors utilize a more than one 12v rail) BTUs/h (based on Sine Wave output for APFC PSUs...
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NETWORK ADAPTER (NIC) NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL AUDIO INTEGRATED CONEXANT CX20641 HIGH DEFINITION AUDIO High Definition Stereo support Number of channels Number of Bits / Audio... Ratio Analog Audio Dolby Digital THX Digital out (S/PDIF) Audio Jack Impedance Microphone Line-In Line-Out Headphone Internal Speaker Power Rating COMMUNICATIONS - MT DT SFF X X X 2 16, 20, and 24-bit resolution Support 44.1K/48K/96K/192 kHz sample rates 98 dB DAC outputs, 90 dB for ...
NETWORK ADAPTER (NIC) NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL AUDIO INTEGRATED CONEXANT CX20641 HIGH DEFINITION AUDIO High Definition Stereo support Number of channels Number of Bits / Audio... Ratio Analog Audio Dolby Digital THX Digital out (S/PDIF) Audio Jack Impedance Microphone Line-In Line-Out Headphone Internal Speaker Power Rating COMMUNICATIONS - MT DT SFF X X X 2 16, 20, and 24-bit resolution Support 44.1K/48K/96K/192 kHz sample rates 98 dB DAC outputs, 90 dB for ...
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.... COMMUNICATIONS - NETWORK ADAPTER (NIC) (CONT.) INTEGRATED REALTEK® RTL8111E-VL ETHERNET LAN 10/100/1000 Environmental Operating temperature Operating humidity MT DT SFF 0° C to 70° C (32° F to 158° F) 20% to a Gigabit Ethernet server and network infrastructure is...* Depends on the system environment. 1 This term does not connote an actual operating speed of 1 Gb/sec. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - For high speed transmission, connection to a Gigabit Ethernet server and network infrastructure is required. 21
.... COMMUNICATIONS - NETWORK ADAPTER (NIC) (CONT.) INTEGRATED REALTEK® RTL8111E-VL ETHERNET LAN 10/100/1000 Environmental Operating temperature Operating humidity MT DT SFF 0° C to 70° C (32° F to 158° F) 20% to a Gigabit Ethernet server and network infrastructure is...* Depends on the system environment. 1 This term does not connote an actual operating speed of 1 Gb/sec. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - For high speed transmission, connection to a Gigabit Ethernet server and network infrastructure is required. 21
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - For high speed transmission, connection to 55° C (32° F - 131° F) 5% ~ 85% (non-condensing) Windows® 7, Windows® XP, Windows ... PCIE GIGABIT1 NETWORKING CARD (CONT.) Environmental Operating temperature Operating humidity Operating System Driver Support Manageability (examples WOL, PXE) Management Capabilities Alerting (example ASF 2.0) MT DT SFF 0° C to a Gigabit Ethernet server and 22
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS - For high speed transmission, connection to 55° C (32° F - 131° F) 5% ~ 85% (non-condensing) Windows® 7, Windows® XP, Windows ... PCIE GIGABIT1 NETWORKING CARD (CONT.) Environmental Operating temperature Operating humidity Operating System Driver Support Manageability (examples WOL, PXE) Management Capabilities Alerting (example ASF 2.0) MT DT SFF 0° C to a Gigabit Ethernet server and 22
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... A Type Optional Optional Win XP, Win Vista and Win 7 23 WIRELESS DELL WIRELESS 1520 PCIE WLAN CARD (MT, DT, SFF) 802.11N External Connector Type Controller Details Controller bus architecture WLAN standards supported ...11n Data Rates supported Encryption Operating temperature Operating humidity Operating System Driver Support MT DT SFF Custom WLAN Antenna Connector Electrically compatible with the PCI Express Base Specification v1.1 (x1... full height (FH) cards and DT and SFF supports low profile (LP) cards. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS -
... A Type Optional Optional Win XP, Win Vista and Win 7 23 WIRELESS DELL WIRELESS 1520 PCIE WLAN CARD (MT, DT, SFF) 802.11N External Connector Type Controller Details Controller bus architecture WLAN standards supported ...11n Data Rates supported Encryption Operating temperature Operating humidity Operating System Driver Support MT DT SFF Custom WLAN Antenna Connector Electrically compatible with the PCI Express Base Specification v1.1 (x1... full height (FH) cards and DT and SFF supports low profile (LP) cards. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS -
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... Controller bus architecture (example PCIe 1.0a x1) Driver Support Full height Serial / Parallel add-in dongle Environment Operation Temperature Operation Humidity Storage Temperature MT DT SFF RS232 and PS2 24 pins header connect to MB directly Optional 1 Serial, 2 PS2 Optional 0° C to 70° C (32° F to 158° F)...condensing) -20 to 85°C (-4 to 185°F) COMMUNICATIONS-PS2/SERIAL ADD IN DONGLE NOTE: MT supports full height (FH) dongle and DT and SFF supports low profile (LP) dongle. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS -
... Controller bus architecture (example PCIe 1.0a x1) Driver Support Full height Serial / Parallel add-in dongle Environment Operation Temperature Operation Humidity Storage Temperature MT DT SFF RS232 and PS2 24 pins header connect to MB directly Optional 1 Serial, 2 PS2 Optional 0° C to 70° C (32° F to 158° F)...condensing) -20 to 85°C (-4 to 185°F) COMMUNICATIONS-PS2/SERIAL ADD IN DONGLE NOTE: MT supports full height (FH) dongle and DT and SFF supports low profile (LP) dongle. DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL COMMUNICATIONS -
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DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. The DisplayPort controller does not support multi-monitor display in DOS. Intel HD Graphics 2000 [with ... (Hz) (Note: Analog and/or digital) External Connectors HDMI Bus Type Maximum supported resolution Maximum power consumption Audio Support External connectors MT DT SFF Integrated Gen6 Core Intel® HD Graphics /HD Graph- ics 2000 @ 850MHz Depends on available system memory (Up to 1.7GB with 4GB system...
DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER NOTE: MT supports full height (FH) cards and DT and SFF supports low profile (LP) cards. The DisplayPort controller does not support multi-monitor display in DOS. Intel HD Graphics 2000 [with ... (Hz) (Note: Analog and/or digital) External Connectors HDMI Bus Type Maximum supported resolution Maximum power consumption Audio Support External connectors MT DT SFF Integrated Gen6 Core Intel® HD Graphics /HD Graph- ics 2000 @ 850MHz Depends on available system memory (Up to 1.7GB with 4GB system...
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.../ 16.764 x 6.936 No 6.6 x 2.731 / 16.764 x 6.936 10°-50° C 5-90% RH 0-20,000 ft. 26 DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER (CONT.) 1GB AMD RADEON™ HD6450 Bus Type (example integrated or PCIe x16) GPU core clock Frame Buffer... of low profile card inches/centimeters (L x H) Environmental Operating Conditions (Non-Condensing): Operating Temperature Range Relative Humidity Range Altitude Range MT DT SFF PCIEx16 625Mhz 800Mhz 20W Yes 32-bit 85Hz Yes D3D and OpenGL Dual-Link DVI Max: 2560 x 1600/32bpp @ 75Hz DispalyPort Max: ...
.../ 16.764 x 6.936 No 6.6 x 2.731 / 16.764 x 6.936 10°-50° C 5-90% RH 0-20,000 ft. 26 DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL GRAPHICS/VIDEO CONTROLLER (CONT.) 1GB AMD RADEON™ HD6450 Bus Type (example integrated or PCIe x16) GPU core clock Frame Buffer... of low profile card inches/centimeters (L x H) Environmental Operating Conditions (Non-Condensing): Operating Temperature Range Relative Humidity Range Altitude Range MT DT SFF PCIEx16 625Mhz 800Mhz 20W Yes 32-bit 85Hz Yes D3D and OpenGL Dual-Link DVI Max: 2560 x 1600/32bpp @ 75Hz DispalyPort Max: ...
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DVD-ROM External Dimensions inches/ centimeters (Without Bezel - DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL OPTICAL DRIVES DVD +/- using DVD+R media provides maximum compatibility. W x H x D) MT 148.2mm(6in)/42mm (2in)/ 190.5 (max) DT 148.2mm(... 750g SATA 1.5Gbit/s Standard supplier dependent supplier dependent N/A 16x DVD/48x CD 750g SATA 1.5Gbit/s Standard supplier dependent supplier dependent N/A 16x DVD/48x CD SFF 128.0 mm (5.04)/ 12.7mm (0.5 in )/ 126.1mm (4.97in) Weight (max) pounds/kilograms 800g Interface type and speed Disc Capacity Internal buffer size...
DVD-ROM External Dimensions inches/ centimeters (Without Bezel - DELL™ OPTIPLEX™ 390 TECHNICAL GUIDEBOOK -FINAL OPTICAL DRIVES DVD +/- using DVD+R media provides maximum compatibility. W x H x D) MT 148.2mm(6in)/42mm (2in)/ 190.5 (max) DT 148.2mm(... 750g SATA 1.5Gbit/s Standard supplier dependent supplier dependent N/A 16x DVD/48x CD 750g SATA 1.5Gbit/s Standard supplier dependent supplier dependent N/A 16x DVD/48x CD SFF 128.0 mm (5.04)/ 12.7mm (0.5 in )/ 126.1mm (4.97in) Weight (max) pounds/kilograms 800g Interface type and speed Disc Capacity Internal buffer size...