He never mentioned the third card as being a designated PhysX one, that could make a ~250W difference on an overclocked 480
Good point. I put in one gtx 480 it came to 575w, I put second overclocked and overvolted gtx 480 it came to 865w, so 290w difference. So to have 3 gtx 480 its gonna be around 1155w. So a decent 1200w psu is gonna be required here id say.