pushing 3x 470 nitro's a bit hard at 230~ sol each.. + overclocked 2500k cpu + some hdds = 620-650w@wall..

630w Rosewill green series psu... been perfectly stable since 9.0 release..
guess it doesn't have any "fancy protection" other than when it catches on fire and/or explodes 
(definitely seeing the spikes to 250+w~ per card though.. rather scary.)