Since last Friday I'm using P67A-UD7-B3, too.
I found a few things that I don't "lik". First was the fact that only one fan can be controlled (BIOS F3c JZ). And vcore (fluctuation) even with llc 1 is horrible in comparison with my former used ASRock Fatal1ty.
But I also had an issue with switching frequency. I set my 2500k with multiplier 48 and vcore 1.35 volts. Under load frequency went down to 4700 mhz constantly. I tried different settings in bios but everytime I got 4700 under load. Then I just upped vcore to 1.40 and multiplier to 50 and frequency stayed at 5 ghz all the time.
Does anybody has experienced the same issue?





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). That didn't help at all. The only thing that helped was upping vcore and multiplier. Everything else remained the same - and it worked. 



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