But both the 920 and P6T put on a little show and came up big. The maximum baseclock I could achieve with stability was 222MHz. But this was pretty much bench stable. 220 was stable enough to be prime stable at 220x18, or 3.96 GHz, pretty sweet so far. To get there I needed just 1.38 volts on the CPU, a QPI voltage of 1.39v, IOH of 1.36v, CPU PLL voltage of 1.86 with the memory at 1.62 volts. Not a whole heck of a lot to do to bust out that kind of speed. But of course, 3.9 is not enough and I wanted to see if the little 920 was indeed a bona fide 4GHz chip without big volts. To push higher, I dropped the base clock down to 215MHz from 220MHz with a multiplier of 19 to get to 4.1GHz. I was expecting a fight to get there and was surprised at the fact that all it took to get this clock speed stable was an increase in the CPU voltage to 1.395volts with no other changes to the previous voltage settings. Now the one thing I found that you have to do though is keep air flowing over the X58 chip to keep it cool to maintain stability at the high baseclock levels I was playing at. Other than that, nothing really special was needed to push the clock speeds on the P6T. I have got to say that the board delivered the overclocking goods with an untested CPU.

http://www.overclockersclub.com/reviews/asus_p6t/