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What size PSU would I need?

By Predict
May 10, 2008
  1. I am upgrading my computer but I dont no if I need to upgrade my psu also. I have 600watt psu but it dosnt seem like it would be enough power when there running at their hardest.

    EVGA GeForce 8800 GTS SSC 640mb
    EVGA GeForce 8800 GTS SC 320mb
    Athlon 64 X2 6400+
    PC6400 DDR2 800MHz E.P.P. Memory (2 x 1024)
    500GB Hard Drive - 7200, 16MB (x2)
     
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    It's not just the wattage of a supply that counts. If it has dual 12 volt rails at a decent power rating, the existing 600 watt supply should work. If not, it should be replaced. A 450 watt dual 12 volt supply could probably power your present system just fine
     
  3. Bruce2

    Bruce2 TS Rookie

    If you decided to get a new psu, go with a known brand as for better construction, better regulation.. and warranty.
     
  4. mailpup

    mailpup TS Special Forces Posts: 6,980   +362

    For some specific power supply recommendations you can check the Nvidia website for SLI certified PSUs. Click here.
     
  5. jaceX173

    jaceX173 TS Rookie

    What PSU for 9800GTX

    Hallo, just need your help about PSU for my geforce98000GTX. There is describe that it needs 24A current min but my supplayer is BFG 800W but only 20A. Will it strongly affect a performance ?? Not wrealy happy to buy it new one but want my machine to perform properly. Give me some advice guys.

    Rest of spects:

    CPU: Athlon 6400
    Matherboard: ASUS M2N32SLI
    RAM: 3GB
    HDD: 500GB sata

    Also is it PCI 2.0 wrealy need for this card?? I have 1.1
     
  6. mailpup

    mailpup TS Special Forces Posts: 6,980   +362

    Check your power supply sticker or the box it came in again. It should have 20A each on four +12V rails. While it isn't as simple as adding up the four rails' amps, you should have plenty of total power. Don't forget to hook up the additional power connectors on the graphics card.

    Your graphics card should be backwards compatible with your PCI-E x16 slot.
     
  7. jaceX173

    jaceX173 TS Rookie

    Yes sticker says that there is 4 * 20A so from what you saing should be allright. Thougt it have to be somethink like 4 * 24 or somethink. Also it have 4* those 6 pin connectors for
     
  8. Tmagic650

    Tmagic650 TS Ambassador Posts: 17,244   +234

    You're ok with what you have. The 6-pin connectors are used with some graphics cards and with some motherboards
     
  9. jaceX173

    jaceX173 TS Rookie

    Thats ok, thanks for help lol :)
     
  10. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,715   +397

    If you have any way of running power from 2 of those rails to your card (as opposed to just plugging from 1) I would do it. Like those 2 4-pin molex to the pci-e power connectors, plug in each end to a different rail.

    It likely won't matter since those recommendations I believe are based on only having a single rail so they consider other components. The card would have to pull 288W by itself to use up 24A, and it doesn't.
     
  11. okayson

    okayson TS Rookie

    What size PSU would I need?
    Hello everyone. I am new to Techspot so excuse any improprieties on my part. I currently have a system with the following specs:- CPU Intel Core 2 Extreme X6800 2.93 GHz Processor; 2 Raptor HDD 150gb and 2 other HDD 750gb; EVGA nForce 680i SLI nVidia motherboard; EVGA GeForce 7600 GT video card; CoolIT Eliminator Thermoelectronic CPU Cooler; Crucial Ballastic 4GB PC2-8500 SDRAM 240-pin DDR2 Memory and 2 Lite-On LH-20A1S SuperAllwrite SATA DVD Burners. My case is an Ultra Grid ATX Mid-Tower Case with a Thermaltake ToughPower 750-Watt ATX Power Supply. On paper, all this seems wonderful but my systems keeps freezing, and the noise from the computer... I can hear it in the bedroom. What is wrong with this system? Do I need a bigger PSU? Or have I just mis-connected the PSU rails a la Tmagic650??
     
  12. captaincranky

    captaincranky TechSpot Addict Posts: 11,705   +1,887

    Is this 2 GT8800s in SLI? Cause that take could take a bunch of amps at 12 volts.
     
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