I don't know what Package C State Support is, but I recommend leaving it enabled because I think C1E is one of the C states. However, if its default value is Disabled, then of course leave it disabled.
C1E should be set to Enabled just to be sure that it's always working.
LLC should be set to a value that minimizes vDroop the most without getting any vRise (no spikes).
ORIGINAL: Well after some playing around with C states this morning and taking some advice from another source about spread spectrum being disabled, I thought I'd quickly try it, eurgh something just made my gflops go rubbish (16~ compared to 60+~). I'll try disabling Package C State Support again and see what the results are, failing that I'll re-enable it again and also enable spread spectrum and see the results then.
Additionally disabling spread spectrum gives me a nice 100.0MHz number on the bus without having to set 100.2MHz now. One can only learn the different effects from trial and error I guess.
EDIT: Changing those made no difference, still 16 gflops. The only differences remaining are the C3 and C6 states being disabled and the loadline and vcore settings being different, none of which (except C states) I can see effecting the gflops performance this badly. I'll revert back to my previous overclocking profile to be certain that still produces the gflops I remembered seeing. The power usage has also dropped by around half when the processor is under load (about 50W now) and as such the temperatures are much lower too, very wrong.
Edited by Ixel - 8/13/11 at 3:05am