Calculated 340W ..BF1983 said:Actually, even if you want to overclock insanely, you wont need too much power. Check out this PSU calculator eXtreme OuterVision :: eXtreme PSU Calculator
If you add your system components, you will see that the max load of your system (at 4 Ghz speed at 1.7 Volts) is barely 315W.