If u like FritzCheesbenchmark, today morning i got quickly run, its max with 1.425V :). Later will see, what about example 1.5V :). But from my experience, efectivity overclock in MHz/low power cons. is the best this: 1.44V and 4200 MHz stable, because for next 100 MHz at CPU, i need next +0.045V. Good point my stability is to 4GHz with onlly 1.375V ! For comparsion, Gulftown 3.33 GHz has at default setings about 12 700 score