Highly rated 620W PS, can run 8800GTX's in SLI, which I do. My wall power meter only reads a 420 watt draw (e6700, Abit IN9 680i, 1 HD, 1 OD, 5 x 120mm fans, 3 x 92mm fans, 1x 40mm fan, 2x 50mm fans), so the 620W Corsair puts out plenty. In that range it's also very efficient, 80% or better on...