Well, I got my q6600 semi-stable at 3.8ghz. It will run prime95 without errors for about 3 hrs and then it will crash and reboot around the 3 hr mark. It requires 1.58vcore (actual) to do this though. My cpu has a VID of 1.300. I have the chance to get a 1.275 VID q6600- wonder if it's worth giving the other chip a try...

Sparda, I have the DFI P35 board and I love it. It is definitely a tweaker's board, so if you don't want to deal with the myriad of bios options, then a DFI might not be the right board for you. That said, I'm merely a novice but have found many very helpful DFI templates and info on these forums.