I've had mine on 100% for some time now, and it seems to be doing fine at 191X21 @ 1.35 vcore. The temps seem a little high for my taste, but everyone suggests 70ish is normal for the i7 on load. Are you i7 guys leaving the CPU usage at 100%?

Here is a screenshot of what it is doing:


It seems to be able to get 30k+ if I'm away from the computer just letting it crunch. The power even cut off at my house one day and it got 20k while being off for 8 hours.