I don't have B3. Overheating isn't a problem either, I made sure of that. The 2500k runs very cool, 19-24* even under load. I am using all 6 SATA ports but my windows installation is using the SATA 2 port to minimize potential problems.
You think it has to do with the P67 SATA issue? That doesn't explain the onboard audio failure, maybe I just got a bad board, period.