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Power supply for hd 6950 in crossfire?

This is what someone else said to me "You have 52a on the 12v rail. That's 624w. An HD6950 crossfire system pulls 470w on an [email protected]: http://www.anandtech.com/show/4239/n...e-card-king/16. Your system would probably pull a bit more, but you still have enough headroom to give it a go. I'd take it easy on the overclocks on those cards, though, and probably avoid pushing the Powertune current control up much.

I just played around with that PSU calculator and it came up with 490w for your system (actually 514w if I include a DVD-Rom drive, which is silly since it's usually not running). Almost exactly what I would have estimated based on Anandtech's results."
 
Its how much energy it pulls from the mains, compared to output, ie it would pull 650w from the mains to give you 520w
 
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