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Question about my build and PSU rail amperage

post #1 of 5
Thread Starter 
Hey OC,

I just recently bought and installed 2 EVGA GTX 580 Classifieds and a Thermaltake 1050w G PSU for my gaming rig. I plan to play games in 3D when my monitor gets in tomorrow. I noticed when installing the cards that they say they require 600 watts and 42 amps from the 12v rail per card, and the PSU I bought says it only goes up to 40 amps on the 12v rail. Should I be worried? I plugged in all of my information into the PSU calculator found here and it says I'm good with a 850 or so (which seems pretty off to me actually). I don't plan to overclock the 580's because they're doing everything my 560 Ti did without sweating and then some. I do currently overclock my RAM and CPU, though. Any information would be greatly appreciated!
post #2 of 5
Actually that should be fine. 580 really don't draw that much power as they've stated, even in Furmark. When I looked in to actual power draw of 580's, 3 of them in SLI would only draw 719w or 59.91 amps.
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Black Box
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post #3 of 5
The specs they list are above are for the total system, not for just the card.

You would more than good with an 850 watt psu for 2 580's in sli.
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post #4 of 5
http://www.guru3d.com/article/liquid-cooling-overclocking-geforce-gtx-580-danger-den/8

guru3d estimates a heavily overclocked liquid cooled gtx580 at using less than 300w, so youd be fine with a good 750w unit. nothing to worry about the rails either, the 12v1 has 40amps and the 12v2 has 80, if you have the toughpower grand
post #5 of 5
Thread Starter 
Yeah, toughpower grand. I'm glad I went with the 1050w then. I almost considered sticking with the 700w I had. Thanks for giving me peace of mind, guys. biggrin.gif
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