I am sure about that and well aware of it. Actually from day 1 I go onto forums, people keep telling me that. Even though it is not 3.6GHz overclockable, I can still manage to make it going at 3.0GHz, but at idle, its temperature already shoots up to as high as 55 Celsius. After running any games, it could go as high as 76 Celsius. I know for a fact that will shorten the life span of the CPU. Actually, this Q6600 die was first deployed on another machine and I migrated it to the current rig I have 2 years ago. So it is already some 3 years in service from day 0.
And it is still doing well is because I never overclock it.
Put it this way, if i5 2500K @ 3.3 is the same as Q6600 @3.0 (overclocked), I would rather get a i5 2500K to have it running quiet and cooler. The only question now I have is that: Is the performance of the i5 2500K @ 3.3 (stock speed) the same as Q6600 @ 3.0 (overclocked)? If so, I would very much likely switch to the i5 2500K, then I will keep the Q6600 as a collection in my home museum