Able to hit 3.8 GHz on a i7 920 on a gigabyte x58-extreme.
Using air cooling (TRUE 120).
Vcore 1.375V
QPI 1.260 V
190 FSB
8:2 RAM
36x QPI
16x uncore

Temp max: 56 C (good airflow)

One thing I'll say is that bringing the uncore multiplier below 16 made it so I couldn't even POST past 3.5 GHz.

I'm also running into a weird situation with RAM (like a previous poster here), where it adds 1 to the CAS latency in CPUZ.