I have now tweaked this Intel E8400 cpu to 3.6ghz as I had hoped to. And it doesn't even seem to affect it. Nothing has glitched thus far, and I recommend this cpu to anyone wanting to overclock. I will go Quad Core later, but only when the price comes down. 5.8 in the Windows Experience score, and that is the cpu. All other scores are at 5.9, the max value available.