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question about power supply for gtx770 sli

cpu i5 3570k
gpu gtx 770 4gb windforce
psu Corsair Professional Series HX 750 Watt ATX/EPS Modular 80 PLUS Gold
case vengeance c70
motherboard: Gigabyte Intel Z77 LGA 1155 AMD CrossFireX/NVIDIA SLI W/ HDMI,DVI,DispayPort Dual UEFI BIOS ATX Motherboard GA-Z77X-UD3H
OS:win 7 home prem 64 bit
ram: vengeance 2X 4gb 1600mhz
cpu cooler: Corsair Hydro H100i

will that psu be enough on that build if i add sli or should i switch to same brand but 850w and does it supports sli
7 answers Last reply Best Answer
More about question power supply gtx770 sli
  1. 750W is enough for GTX 760 SLI but I recommend getting 850W for GTX 770 X 2.
    750W should probably run 770 SLI as well but it would be running on its max all the time which is not a good thing.

    Better to stay on the safe side as price difference between both of them is not much.
    You might also want to consider buying PSU from Seasonic instead.

    They have high quality gold japanese caps and are better overall than corsair.
  2. Yes, it will be enough. It has all required connectors, and 62A on +12V rail.
    But, 770 sli need 62A too. I dont know if you won't get any perfomance issues.
  3. well ill get 850 one i guess but what do u mean by 62a
  4. Best answer
    funnysword1414 said:
    well ill get 850 one i guess but what do u mean by 62a


    He means that 62 Amperes of current flows on +12V Rail and that is required for GTX 770 X 2. So your PSU would run at its max all the time that is why he is not sure if you would encounter power related issues or not.

    There is a single rail in that PSU so you just have to multiply the current with 12 to get the amount of wattage supplied by the PSU.

    62 x 12 = 744W (750W Rounded off.)
  5. funnysword1414 said:


    OCZ also makes good PSUs but choose one of these if possible to get beat quality -

    http://pcpartpicker.com/part/seasonic-power-supply-ss850htsilver (Silver)

    http://pcpartpicker.com/part/seasonic-power-supply-x850 (Gold)

    Both are great and difference is just in efficiency.
  6. well thanks guys ill get Corsair Professional Series HX850w its 70A and i use corsair on my current build and i like it :)
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