Looking at this 570 gtx from EVGA

[Guest]

EVGA 025-P3-1579-AR GeForce GTX 570 (Fermi) HD 2560MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Down in the details its says it needs:
"Minimum of a 550 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 38 Amps)"

Im running a 750w Antec Blue which lists the following:
+3.3V@25A, +5V@25A, +12V1@25A, +12V2@25A, +12V3@25A, +12V4@25A, -12V@0.8A, +5VSB@3.0A

So...my question(s) are:
1) the GPU takes x2 6 pin connectors. would that be 12v@25A x2 = 50Amps?
2) If taking 550/12v = 45.8 amps...then that would only leave 100watts for everything else. (45.8-38)*12=100w (roughly). Does that seem right for 100watts to run everything else?
3) I am wrong completely and this thing needs a single 12v rail with 38 amps which of course my psu will not work.

 

[mactronix]

No the rating (which they always overstate by the way) is for the whole system. The 38 Amps is for the combined rails.

You are totally wrong.
Main thing is you can run the card easily.
That card actually uses about 300 Watts Max. The reason why they use 2 power connectors is because there is a limit to how much you can send over a single cable. Its not a defined actual standard but its as close as it gets.
The PCIE slot on the motherboard supplies some power and the extra cables supply the rest. Amps wise the card actually uses 25 or there abouts. 300 watts divided by +12v = 25

Mactronix

 

[FlintIronStagg]

No the rating (which they always overstate by the way) is for the whole system. The 38 Amps is for the combined rails.

You are totally wrong.
Main thing is you can run the card easily.
That card actually uses about 300 Watts Max. The reason why they use 2 power connectors is because there is a limit to how much you can send over a single cable. Its not a defined actual standard but its as close as it gets.
The PCIE slot on the motherboard supplies some power and the extra cables supply the rest. Amps wise the card actually uses 25 or there abouts. 300 watts divided by +12v = 25

Mactronix

+1 - I run my 570 easily with a 600w

 

[Guest]

Best answer selected by vexille.