Replacement PSU for Optiplex 790

I want to upgrade the PSU so I can use a better graphics card on the Optiplex 790. What is the best replacement with no rewiring?
13 answers Last reply
More about replacement optiplex
  1. Do you have the desktop version or the minitower version or the small form factor version or the ultra small form factor version of the Dell OptiPlex 790?

    The power supply form factors are different depending on what chassis style you have.
  2. I have the minitower version. It has the 265 watt power supply and the 25 watt PCI-e 16 slot. I'd like to use either a HD 5670 or a HD 6570
  3. OOps...it has the slot rated at 35 watts.
  4. Your biggest limitation is Dell's decision to limit the PCI-e x16 slot's maximum power draw to 35 watts.

    That is why they only offered the Radeon HD 6450 and Radeon HD 6350 as their only discrete graphics card options. The Radeon HD 6450 is a 27 Watt card and the Radeon HD 6350 is a 19.9 Watt card.

    The Radeon HD 5670 is a 64 Watt card.

    The Radeon HD 6570 is a 60 Watt card.

    Both of the cards, that you are considering, draw all of their power through the PCI-e x16 slot. Both cards exceed the PCI-e x16 slot's maximum power draw of 35 watts.

    If you were to upgrade the power supply and use either the Radeon HD 5670 or the Radeon HD 6570 graphics card you would risk burning out the copper traces on the system board essentially rendering your system useless. The current draw through the copper traces will be greater than what it was designed to handle.

    Do you still want to risk the destruction of your motherboard by upgrading?

    You're better off saving up your money and buying a system that doesn't use a proprietary motherboard with such design limitations forced upon you.
  5. ko888 said:
    Your biggest limitation is Dell's decision to limit the PCI-e x16 slot's maximum power draw to 35 watts.

    The Radeon HD 5670 is a 64 Watt card.

    The Radeon HD 6570 is a 60 Watt card.

    Both of the cards, that you are considering, draw all of their power through the PCI-e x16 slot. Both cards exceed the PCI-e x16 slot's maximum power draw of 35 watts.

    If you were to upgrade the power supply and use either the Radeon HD 5670 or the Radeon HD 6570 graphics card you would risk burning out the copper traces on the system board essentially rendering your system useless. The current draw through the copper traces will be greater than what it was designed to handle.


    Would a PCIe card with external power connectors prevent his system board from burning up?
  6. lysinger said:
    Would a PCIe card with external power connectors prevent his system board from burning up?

    It may, but the graphics card manufacturers never reveal how they designed the power draw distribution between the PCI-E x16 slot and the PCI-Express supplementary power connector.

    If the graphics card's power VRM circuit is properly designed it should draw its maximum from the PCI-E supplementary power connector(s) first before drawing from the PCI-E x16 slot. Well that's the way I would design it. The PCI-E slot power source should be treated as the power source of last resort by the graphics card.
  7. Great...thanks for the help!
  8. What do you recommend for a system. I'm a light gamer....Golf, Madden, Lego Racers etc. Current computer is a Dell Dimension 4600 P4, but I looking to upgrade?
  9. Are you looking at buying a consumer desktop or a build-it-yourself system?

    Provide the following information:

    Approximate Purchase Date: (e.g.: this week (the closer the better))

    Budget Range: (e.g.: 600-800 USD) Before / After Rebates

    System Usage from Most to Least Important: (e.g.: Folding@Home, gaming, surfing the internet, watching movies)

    Parts Not Required: (e.g.: keyboard (indicate if USB, PS/2, BlueTooth, etc.), mouse (indicate if USB, PS/2, BlueTooth, etc.), monitor (list all available video input ports), speakers, OS Version (indicate whether it's the 32-bit or 64-bit edition)) **Include Power Supply Make & Model If Re-using**

    Preferred Website(s) for Parts: (e.g.: newegg.com, ncix.com, etc. -- to guide in selection & pricing)

    Country: (e.g.: India) we need to know where these parts are being assembled (i.e. component selection may be limited, input voltages are different)

    Parts Preferences, if any: by brand or type (e.g.: I would like to use an AMD CPU & Biostar mobo with a 24" LCD and full tower case)

    Overclocking: Yes / No / Maybe

    SLI or Crossfire: Yes / No / Maybe

    Monitor Resolution: (e.g.: 1024x768, 1280x1024, 1440x900, 1600x1200, 1680x1050, 1920x1080, 1920x1200)

    Additional Comments: (e.g.: Need to have a window and lots of bling, I would like a quiet PC)
  10. Consumer Desktop Preferred


    Purchase date now

    Budget $700 to $800

    Photo scrapbook, gaming, internet, Microsoft Office stuff

    Need all parts except monitor - 64 bit Windows 7, XP mode enabled

    No preference for website

    No preference for country>>>just want a stable, reliable system

    Radeon HD 6770, Intel i5-2400 3.1 GHz

    8gb Memory

    500 GB to 1 tb drive

    CD/DVD/ROM/RW+ (2) OR DUAL

    Overclocking no

    SLI / Crossfire no

    No monitor
  11. I don't recommend consumer desktops because the options are too limited. They are too proprietary and limited in upgradability as you have found.

    Try the following site if you live in the US:

    http://www.cyberpowerpc.com/

    A lot more customization options available.
  12. You most definitely can, however you WILL need to upgrade the power supply. Choose one that is the same measurements as the stock power supply - I chose a Silverstone 600w Strider. I then had to drill out the HDD cage to remove it so my graphics card could fit and tossed in an ATI 6950 2GB videocard. This is a highend card for this system for sure - runs games like a dream now.

    I have the i3-2100 version with 4GB Ram. Obtained this unit used for 150 dollars.
  13. ASUS M5A97 LE R2.0 AM3+ Motherboard - Qty: 1
    Motherboard Specifications
    Processor Socket AMD
    Processor Interface Socket AM3+
    Form Factor ATX
    Processors Supported Sempron
    Athlon II
    Phenom II
    AMD FX
    Chipset
    Northbridge AMD 970
    Southbridge SB950
    Memory
    Memory Supported DDR3 1866 MHz
    DDR3 1600 MHz
    DDR3 1333 MHz
    DDR3 1066 MHz
    DDR3 2133 MHz (O.C.)
    Memory Type DDR3
    Maximum Memory Supported 32GB
    Number of Slots 4
    Audio
    Channels 8 Channels
    Audio Chipset Realtek ALC887
    LAN
    LAN Type 10/100/1000 Mbps Gigabit
    I/O Ports
    PS/2 Keyboard Connectors 1
    PS/2 Mouse Connectors 1
    USB Ports (Total) 8
    USB 3.0 Ports 2
    LAN Ports 1
    Audio Out Jacks 3
    ATX Power Connectors 1 24-pin EATX Power Connector
    1 4-pin ATX 12V Power Connector
    Fan Connectors 3 x Chassis
    1 x CPU
    S/PDIF Connectors 1
    Expansion Slots
    PCI Slots 2
    PCI Express X1 Slots 2
    PCI Express X16 Slots 2
    RAID
    RAID Support Yes
    RAID Modes 0
    1
    10
    5
    Dimensions
    Length 12 inch
    Width 9 inch
    AMD FX-4130 3.8GHz Quad Core AM3+ Unlocked CPU - Qty: 1
    Processor Specifications
    Manufacturer AMD
    CPU Type Desktop
    Processor Interface Socket AM3+
    Processor Class FX
    Processor Speed 3.80GHz
    Cores Quad
    L2 Cache 4MB
    L3 Cache 4MB
    Fan Included
    Wattage 125W
    Additional Technologies HyperTransport
    AMD64 Technology
    AMD Turbo Core Technology
    Unlocked Multiplier Yes
    Instruction Set SSE
    SSE2
    SSE3
    SSE4a
    Integrated Graphics Core No
    Integrated Memory Controller Yes
    Corsair CMX4GX3M1A1333C9 XMS3 4GB DDR3 RAM - Qty: 1
    Memory Module Specifications
    Memory Category Desktop
    Desktop
    Memory Type DDR3
    DDR3
    Memory Speed PC10666
    PC10666
    Memory Speed MHz 1333MHz
    1333MHz
    Memory Size 4096MB
    4096MB
    Total Memory Size 4GB
    4GB
    Memory Modules 1
    1
    Memory Channels Dual
    Dual
    Memory Socket DIMM
    DIMM
    Memory CAS Latency 9
    9
    Memory Timing 9-9-9-24
    9-9-9-24
    Pins 240
    240
    Voltage 1.5V
    1.5V
    ECC No
    No
    Memory Buffer Unbuffered
    Unbuffered
    Corsair CMX4GX3M1A1333C9 XMS3 4GB DDR3 RAM - Qty: 1
    Memory Module Specifications
    Memory Category Desktop
    Desktop
    Memory Type DDR3
    DDR3
    Memory Speed PC10666
    PC10666
    Memory Speed MHz 1333MHz
    1333MHz
    Memory Size 4096MB
    4096MB
    Total Memory Size 4GB
    4GB
    Memory Modules 1
    1
    Memory Channels Dual
    Dual
    Memory Socket DIMM
    DIMM
    Memory CAS Latency 9
    9
    Memory Timing 9-9-9-24
    9-9-9-24
    Pins 240
    240
    Voltage 1.5V
    1.5V
    ECC No
    No
    Memory Buffer Unbuffered
    Unbuffered
    XFX Radeon HD 6570 1GB GDDR3 Video Card - Qty: 1
    Connections
    Interface Type PCI Express 2.1
    Interface Speed x16
    Connector(s) 1 x HDMI
    1 x D-Sub (VGA)
    1 x Dual-Link DVI-I
    Multiple Monitors Support Yes
    Lifestyle
    Chipset AMD Radeon
    GPU Series Radeon HD 6000
    Lifestyle Mainstream
    Performance
    GPU/VPU AMD Radeon HD 6570
    Additional Features AMD HD3D Technology
    AMD EyeSpeed Technology
    AMD PowerPlay Technology
    Maximum Analog Resolution 2048 x 1536
    Maximum Digital Resolution 2560 x 1600
    Video Card Profile Low Profile
    Single-Slot
    Memory
    Memory Type GDDR3
    Memory Interface 64-bit
    Video Memory 1024MB
    Core Clock 650 MHz
    Memory Clock 1.0 GHz
    Features
    APIs DirectX 11
    1080p Support Yes
    Video Output Dual DVI
    HDMI
    VGA
    Low Profile No
    Cooling Type Fan
    Multi-GPU Support CrossFireX
    Minimum PSU Wattage Requirement 400 Watt
    Specification Notes
    Specification Notes [1] To provide the most accurate specifications, the specifications listed are based upon the manufacturer's exact model specification as published on the manufacturer's website, and the manufacturer's product documentation.
    LG Internal 24X Multi Drive - Qty: 1
    CD/DVD/Blu-Ray Drives GS
    Type CD/DVD Burners
    Performance
    Cache Size 2 MB
    Transfer Rate 22.16 Mbytes/s (16x) max
    DVD Specs
    DVD-R Write Speed 24X
    DVD Read Speed 16X
    CD Specs
    CD Write Speed 48X
    CD Rewrite Speed 32x
    CD Read Speed 48X
    Physical Specs
    Color Black
    Length 6.4"
    Width 5.7"
    Height 1.62"
    Weight 1.54 lbs.
    Configuration
    Load Type Tray
    Interface Type SATA
    Enclosure Type Internal
    Compatible Writable Media CD-R
    CD-RW
    DVD+RW
    DVD-R
    DVD+R DL
    DVD-R DL
    DVD-RW
    DVD+R SL
    Supported Formats CD-R
    CD-ROM
    CD-RW
    DVD-RAM
    DVD+RW
    DVD-R
    DVD+R DL
    DVD-R DL
    DVD-RW
    DVD+R SL
    DVD-ROM SL
    DVD-ROM DL
    Ultra LSP650 650-Watt Power Supply - Qty: 1
    Power Supply Specifications
    Form Factor ATX
    Wattage 650W
    SLI/Crossfire SLI Ready
    Modular Cabling No
    Special Features Manual 130v & 220v Switching
    Energy Efficiency 80%
    Fan 135 mm
    Input Voltage 115 ~ 230
    +3.3V 24 A
    +5V 32 A
    +12V 1 38 A
    -12V 0.6 A
    +5VSB 2 A
    Dimensions 5.90" (150mm) H x 6.22" (158mm) D x 3.34" (85mm) W
    Connector Specifications
    Motherboard Connector 20+4 Pin
    4-Pin P4 1
    4-Pin/8-Pin EPS Connector 1
    6-Pin PCI-Express Connector 2
    4-Pin Floppy Connector 1
    4-Pin Peripheral Connector 5
    SATA Power Connector 4
    Thermaltake Commander MS-I Tower Case - Qty: 1
    Computer Case Specifications
    Form Factor ATX Mid-Tower
    Compatible Motherboards ATX
    Bezel Type Plastic
    Side Panel Type Window
    Power Supply Not Included
    Material SECC
    Expansion
    External 5.25" Drive Bays 3
    External 3.5" Drive Bays 1
    Internal 3.5" Drive Bays 5
    Expansion Slots 7
    Media Ports
    Front USB Ports 2
    Front Audio Ports 1
    Cooling System
    120mm Fan Ports 4
    120mm Fans Included 1
    Other Fans Included 1x 120mm Blue LED Fan
    Dimensions
    Depth 16.8"
    Width 8.0"
    Height 19.1"

    http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7545267&Sku=B69-0698

    All for under 500.00
Ask a new question

Read More

Power Supplies Optiplex Graphics Cards Components