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How do the four 12volt 18amp rails work on my OCZ 700 watt power supply?

post #1 of 3
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I really curious as to how the Active PFC works on the power supply because for instance.....my EVGA 8800GTS G92 has a recommended 26 amps for the 12 volt rail but then again the OCZ Game Extreme 700 watt power supply has 4 12 volt 18 amp rails and can run SLI 8800GTS G92's. If you know how the amps are broken down on the OCZ power supply please humor me because I'm still not for sure how OCZ breaks down the amps other than the fact that the power supply has active PFC.
    
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Q6600 SLACR L746B116 OC@3.6GHz EVGA 780i SLI P08 BIOS SLI EVGA 8800GTS G92's @ 775MHz/1944MHz/1936MHz 8 GIG OCZ Reaper 1066MHz @ 950MHz 
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post #2 of 3
If your PSU does NOT have a 115/220v switch on the back, then it has active PFC.

The 700w GXS has 56A available on the combined +12v rails and has active PFC.
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post #3 of 3
Quote:
Originally Posted by droby1987 View Post
I really curious as to how the Active PFC works on the power supply because for instance.....my EVGA 8800GTS G92 has a recommended 26 amps for the 12 volt rail but then again the OCZ Game Extreme 700 watt power supply has 4 12 volt 18 amp rails and can run SLI 8800GTS G92's. If you know how the amps are broken down on the OCZ power supply please humor me because I'm still not for sure how OCZ breaks down the amps other than the fact that the power supply has active PFC.
Active PFC has nothing to do with how many amps are on your +12V rail, how the rails are split up, etc. APFC has to do with AC input. +12V is DC output.

Your rails are split up so one PCIe connector is on one +12V rail, the other PCIe connector is on another +12V rail, the CPU power (4+4-pin) is on a third +12V rail and everything else (24-pin, Molex, etc.) on a fourth.

The 26A that Evga recommends is for the entire system. If you look at the label, you'll see a big square with "680W" in it. That's your maximum +12V output capability. Divide by +12V and you get 56.6666A. So obviously your OCZ has more than twice the power on the +12V you actually need.
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