Pardon my French, but how the hell? ::- D
And you got i7. That's 4 cores (considering you disabled HT - btw, why? won't that reduce your CPU to an i5 with a bit more cache?)
So you got 100% on 4 cores and I got 60% on 2 cores. Something's not right (my side)
Are you running the latest version? I installed it about 10 days ago on Shiternet Explorer (since I never use it, might as well throw Betas on it).