I am helping my dad overclock a i7 930 with Asus P6X58D-E motherboard. I would like to find minimum voltage for 4.0 ghz. Should I run: qpi/vtt: 1.2v cpu pll: 1.8v ? What other voltages should be changed from auto to a fixed number? I was going to start v core at 1.2v and then reduce from there. Thanks.