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GTX 770 actually uses 31 amp but minimum spec says 42 amp

Tags:
  • Battlefield
  • Benchmark
  • Power Consumption
  • Graphics
  • GPUs
Last response: in Graphics & Displays
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October 7, 2013 3:01:29 AM

http://www.anandtech.com/bench/product/829

In this benchmark u see the total system power consumption is 374watt (battlefield 3) so if we divide it by 12 it comes 31 amperes, so why GTX770 requires 42 amperes minimum some one pls clear this thing to me.

More about : gtx 770 amp minimum spec amp

October 7, 2013 3:08:24 AM

Because many PSU manufacturers lie about the about of Watts their supplies can provide and Nvidia is taking this into account. This is why on this forum you'll always see people recommending well known, high quality branded supplies.

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October 7, 2013 3:19:32 AM

so corsair cx500(38 amp) or seasonic 520(40 amp) is good for GTX780(34 amp consumed in tests)
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October 7, 2013 3:27:11 AM

You saw the math yourself. They're good. :D 
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October 7, 2013 5:26:32 AM

No... no... the question is why the Titan requires a 600W PSU with 38A on the 12V rails, and the GTX780, a cut-down version of the Titan, requires a 600W PSU with 42A on the 12V rails... Or why the GTX 670 requires a 500W PSU with 30A on the 12V rails, while the GTX 680, almost the same card with close performance requires a 550W PSU with 38A on the 12V rails, that is 8(!) amperes more...
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Best solution

October 7, 2013 7:15:42 AM

I've rounded the numbers off

Titan TDP = 250 Watt = 21 amps
780TDP = 250 Watt = 21 amps

Sure, that makes no sense actually, they should be the same!

680 TDP = 195 Watt = 16 amps
670 TDP = 170 Watt = 14 amps

So this makes sense that the 680 requires a more beefy PSU. but again, yes I agree, not 8 amps more, but as per my original post, a) many manufacturers lie about the power their supplies give out and b) many consumers don't know any better. So I believe Nvidia is just giving fairly arbitrary numbers way higher than you actually need, just in case.
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