ghnader hsmithot :
I am also wondering about this..How do we know the best mobo for overclocking the SB k-series?I do remember 1 rule in OC and that is not all mobos are created the same.
If you are going to follow a guide, I would suggest getting whatever board the person making the guide used (usually ASUS). If you are doing it on your own, both ASUS and ASRock are good OCing boards. ASUS has more "bells and whistles" while ASRock has much more "bang for buck."
Personally, if I was paying full price, I would get either the ASRock Extreme4 or Pro3. That said, I would have grabbed that ASUS P8P67 Pro for $179 with free shipping if they had that when I was buying a motherboard (I picked the Extreme4 and am happy with it).