I'm not sure what point you are trying to make. It's pulling 600 from the wall much less power is actually being used by the system. Potential output of the power supply is 850 watts maximum, at 80% efficiency(just a number) it would pull 1060 or so from the wall. So in this review the actual components are only requiring 480 watts. Efficiency is calculated as DC output/AC input *100. Hopefully this is what you were trying to say.