Finding a modular power supply that can handle a multi-GPU system can be a
little tough, but the Mushkin HP-580AP 580W Enhanced Power Supply seems capable of
handling just about any of the latest video cards. And with RailFusion, the system
can combine the multiple 12V rails into one if it happens to need more than the 20
Amps provided on a single 12V rail.
http://www.bigbruin.com/2007/mushkin580_1