Originally Posted by El_Capitan
That's great, bro, but if you don't agree with empirical evidence, just leave it to yourself.
Guru3D was able to get their test system
to pull about 433W from the wall when it had two GTX 460s in SLI under full load (source
). If I assume that their PSU was 85% efficient during this power draw, then that would mean the system pulled about 368W from the PSU. Guru3D also usually recommends adding about 100-150W in order to account for the rest of the system which brings the power draw to an extreme maximum of 518W.
So this means that any quality 550W power supply is enough which means the 630W Rosewill Green Series PSU will be bored.