When die-hard overclockers begin to aim for highest possible efficiency in the SuperPI-32M benchmark, it's best to keep your eyes open for tweaking tips. Dinos22, Chew* and 3oh6 found a fundamental performance issue on the P67A-UD7. In particular 3oh6 figured out that when enabling the BIOS option No-Execute Memory Protect, the performance during SuperPI-32M drops significantly and you lose approximately 10 seconds overall. In other words, keep that setting disabled!
Overclockers are currently looking into this option's effect on several other benchmarks, for instance on 3DMark01.