Modified MSR Tools to run on Snow Leopard. You can see the steppings if you have P-states support.
Question: If i use the MSR (old one) with 10.5 i will get extrem high cpu load of the kernel after some time.
Special if i run an app that needs lot of cpu like benches. System (finder) gets first slow then freezes - no more reaction to keyboard and mouse.
I seen that some others have same problem (kernel runs amok after some time). I use vanilla and have C2D with normally no such problems.
Also voodoopower or mark-i work without problem.
Are you the dev and can post source that some code heros can look in (not me; ) ?