I'm running three GTX285 in each system. Both are running 1KW powersupplies but one seems to be a little weak. RC5 running on the GPU's pulls about 705W and is stable. FAH on all three GPU's pulls 730W and shuts down after a while but is stable on two GPU pulling 560W. I have a newer 1KW power supply that I will be swapping in later this week. After looking at how slow the ATI clients run on FAH I think I will put it on RC5 since it is about twice as fast as a GTX285.