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12v rail question

Last response: in Components
June 28, 2012 6:24:43 PM

Hey guys, new to registering but I've been a lurker for awhile lol. Anyways, I have perhaps a neophyte question about a computer I'm building.

What I want to do is get two EVGA GTX 570 cards and run them in SLI. Well, from the specs on the card, it says it needs 550w and at least 38 amps on the 12v rail. If I SLI these, would that then need 76 amps on the 12v rail or need to use another rail entirely? I'm just unsure whether it combines, or, because both only need 38 amps the one rail that has that will cover it.

Any enlightenment will certainly help me tremendously.


More about : 12v rail question

a c 165 ) Power supply
June 28, 2012 6:51:00 PM

single or split 12v rail makes no difference as long as the power supplied is sufficient to meet your needs. you also don't need 76a since the recommendation for a single GPU takes into account your CPU, HDD, etc., and you don't need to double that again unless you are sunning a mobo that has two CPUs.

guru 3D says you will be under 600w at load

Measured power consumption

System in IDLE = 218W
System Wattage with GPU in FULL Stress = 578W
Difference (GPU load) = 360W
Add average IDLE wattage ~ 50W
Subjective obtained GPU power consumption = ~ 410 Watts

so I would look at 750w+ PSU with 60a+ on the 12v rail from brands like corsair, seasonic, xfx, antec, ocz

pretty good deal on the xfx850w
a c 165 ) Power supply
June 28, 2012 7:35:40 PM

FortressDelve said:
Thanks for the reply. I already decided to get a Seasonic Platinum-860 power supply.

It has 71a on the single 12v rail which would satisfy your 60a criteria I think. It just didn't have 76 heh.

very good PSU, you will have no issues with it powering your PC