I would say the ASUS P5Q-E or Maybe a P5E X38 if u can spare some money. I choose ASUS because they have always been good with my OCs and ASUS also gets the first enginering sample from intel as ASUS helped intel alot in mobo designing during the earlier x86 proccesors
DFI if you want to get the best possible overclock for your hardware, and don't mind spending a lot of time tweeking bios options. These boards can be a bit fussy, but once everything is finalized get some really awesome results.
ASUS probably won't have quite the same overclocking potential, but tend to be very stable, while offering some decent overclocking options. If you're looking to do a quick and reliable overclocking job for everyday use, this is the way to go.
The fact that i got my Q6600 @ 3.6 with 1.35volts its a good thing about P5Q-E. Also not many people are getting P45 from DFI which means ASUS will be in the web more and more support for it. There are more then enough bios options in ASUS P5Q-E.
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