Power requirements for 2X GTX 970's?

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_JakeDavies

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Jan 9, 2015
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Hi guys,
I have currently got a system with an i5 and a single gtx 970. I have been saving for a while and have decided to get a threeway sli system and game at 1440P. My system only has a 650W PSU, but i want to put another power supply in my case to power just the 2x GTX 970's so what wattage power supply would i need to power just 2 970's no CPU or anything just 2 970's.

Thanks and BTW my current power supply was a xmas present that's why i'm not interested in selling it and getting as new one, otherwise i would just get a bigger power supply.
 
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10tacle
I've got two 970s and run everything just fine on a Corsair 750W (overclocked CPU, overclocked GPUs, big CPU fan cooler, 5-fan case, multiple hard drives/media drives, etc.). Theoretically you should be able to run them on a 650W depending on what other hardware you have, but remember there is the important factor of power (amps) on the single +12 volt rail and I would not recommend one with less than 50 amps on the single +12v rail (my Corsair has 62A).

Also for efficiency sake, you really need to leave yourself at least a 25% usage margin of max wattage use (so no more than 562 watts for a 750W PSU for example or 487 for a 650W). And like Math Geek says above, make sure you double check that the PSU you choose has *two* full sets...
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Math Geek

Math Geek

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Oct 15, 2014
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just the 2 x 970's would be at most 400w needed if they are the superclocked super cooled ones. however, a smaller wattage psu won't have the 4 pcie power connectors needed more than likely. not sure what the smallest quality unit is that has 4 connectors with it as i have never really looked at it this way.

but 400-450w with about 40-41 12v amps, would be enough for JUST the 2 x 970's if you can find one with the 4 connectors you need.
 
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10tacle

10tacle

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Dec 6, 2008
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I've got two 970s and run everything just fine on a Corsair 750W (overclocked CPU, overclocked GPUs, big CPU fan cooler, 5-fan case, multiple hard drives/media drives, etc.). Theoretically you should be able to run them on a 650W depending on what other hardware you have, but remember there is the important factor of power (amps) on the single +12 volt rail and I would not recommend one with less than 50 amps on the single +12v rail (my Corsair has 62A).

Also for efficiency sake, you really need to leave yourself at least a 25% usage margin of max wattage use (so no more than 562 watts for a 750W PSU for example or 487 for a 650W). And like Math Geek says above, make sure you double check that the PSU you choose has *two* full sets of *two* 6+2-pin PCI-E connectors (it might be referenced in the spec list as something like "4 x 6+2-Pin" under PCI-Express connectors.
 
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