@ Foxdonut: Sweffy is right on with his comment about cooling. I was at 4.7 stable with my Hyper 212+, and I bet if I had tried I could have gotten 5. I booted at 5 but it was not stable running SuperPi.
@mikethor007: If you are not opposed to paying $225 for a board, the ASUS P8P67 Deluxe is great. I have nothing bad to say about this board, and this is the third one I have owned (the problems were with Intel and NewEgg, not ASUS :-P ). If you are looking for a bit less expensive board, try the Gigabyte UD4 or the ASUS Pro.