I'd like to see that run stable ;) I mean, it can go to 4.1Ghz, but if it's only using 2.0 Ghz, there will be no problem till it reachs critical levels. Also, did you adjust voltage? =) Think before you talk bro. I have a brand new i7 1555 socket, 2600K 3.40 Ghz at default, that goes up to 4.4 Ghz stable on proper cooling. You want us to believe, 2.66 Ghz will be stable at 4.1 Ghz? pff.