Geforce 8800 GTS 320MB Power Requirements

Hi

I am purchasing a Geforce 8800 GTS 320MB next week. I had a look on the web as to what the power requirements are for this card and most web sites mentioned that one requires a minimum power supply of 400W with 26A output. I currently have a 400W PSU, but with 20A output on the 12V rail. I had a look a other power supplies (from 500W up to 1000W) like Antec, Vantec, Enermax, Thermaltake etc. and they all range between 18A and 20A on the 12V rail. Isn't there a possibility that the "26A" rating is a rating combined from all the other rails put together. Because I couldn't find a power supply with a 26A rating on the 12V rail alone. All that I can think is that all the rails' outputs measured together can give one 26A. Could someone please shed some light on the situation please. The spec listed on my PSU:

AC Input:
230V 50Hz (5A).

DC Output:
+3.3V : 28A
+5V : 40A
+12V : 20A
-5V : 0.5A
-12 : 0.8A
+5Vsb : 2A Peak : 2.5A

+3.3V & +5V : 225W
Total Power Max : 400W

Could someone work this out for me and let me know if this PSU will work?

you will at least want a 550 watt power supplie

Thank you for the info.

I have read through most of it but I'm still kind of scratching my head.
I am interested in building a new system the uses:

2 Intel Xeon E5320 Clovertown quad-core 1.86GHz Socket 771 CPUs

SUPERMICRO MBD-X7DAL-E-O Dual Socket 771 Intel 5000X ATX Server Motherboard

1 top end 8800GTwhatever Graphics Card

From what I can see, I take it that this PSU would fit the bill...

ENERMAX Galaxy EGX1000EWL ATX12V/ EPS12V/ BTX 1000W Power Supply

It should be, 900W and 75A are dedicated to the 12v rails alone.

Thanks for helping the helpless...

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