Power Requirements

Discussion in 'Videocards - NVIDIA GeForce' started by GarryJames, Dec 27, 2012.

  1. GarryJames

    GarryJames Member

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    GPU:
    Radeon HD 5970
    I have decided to upgrade my graphics card to a EVGA SC Nvidia 680 GTX, however I realise due to the OC that the power specs are different and the Nvidia spec sheets says it needs a 550 watt power supply with a 38 amp on the +12 volt rail. ( this was for a system fitted with an i7 intel 3.2 GHz processor.

    http://www.evga.com/products/pdf/02G-P4-2683.pdf

    I bought my PC from PC Specialist and I understand that the system is fitted with a power supply that has the following

    Manufacturer - FSP
    Model - FSP800-80GLN(85)

    DC Output
    +3.3v 30A+5v 30A
    +12V1 20A
    +12V2 20A
    +12V3 20A
    +12V4 20A
    +5Vsb 3.0A
    -12V 1A
    Total Continuous output 800W

    1x 24pin ATX (20+4)
    1x 8pin CPU 12v (2x4)
    2x 6pin PCIe
    2x 8pin PCIe (6+2)
    2xSATA (1x3, 1x2)
    2xMolex (2x2+2floppy)

    Am I correct and reading that the +12v rail only has 20 amp and will I also need to upgrade my power supply too?

    I took it for granted as this power supply runs my current rig and my son's who has a Radeon HD 5970, I assume this would require more power.

    Can anyone confirm for me please?

    Many thanks
     
  2. Fershlugg

    Fershlugg Master Guru

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    GPU:
    PNY GTX 670
    Are you saying you run two computers from one power supply? Other than that, it seems to me that you have 4) 12V power rails, each supplying 20A. In that case I would say you have more than enough power to run a 680 GTX, as long as you supply it from two different 12V rails.
     
  3. GarryJames

    GarryJames Member

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    GPU:
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    Sorry for the confusion, no I have two computers and they have identical power supplies in each system - they don't run it off of the same power supply. I read that back and can see why you would think that :)

    So just to be clear I need to run the power off different rails. I was hoping to use the current 6 point that powers my current card and then use the 6 to 8 adapter for the second power into the card. However, I actually think it has other leads that are tied up in the case so I could see if I can locate an 8 pin in amongst the wires.
     
  4. alanm

    alanm Ancient Guru

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    GPU:
    Asus 2080 Dual OC
    No you dont have to run power connectors off different rails, just connect normally regardless. Multi-rail and single rail PSUs connect to the same power source but (for marketing) are divided into extra rails. Doesnt affect squat re power draw or connections to components.
     

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