I don't overclock, but my processor's a 3.06Ghz P4 with HT. On a normal day, it'll run between 160-165F (71-73C). On the warm side, I'm sure, but I haven't had problems until very recently, and ONLY with one specific program (everything else ran just fine). The tech support guy insisted that I cool things down.
So I'm sitting there, in front of my computer, wearing my winter jacket because the window's wide open to the New England Winter, with the side panel off the side of my computer. The temp reading creeps down to 140F (60C) and sulks there. AND THE PROGRAM STILL LOCKS UP WITHIN MINUTES.
Want another dollop of truth? This afternoon the devs for said program released a patch. Downloaded, applied, ran. Got up, closed the window, shucked my jacket, and put the side panel back on. Temperature creeps back up to 160F by the time I'm done (half an hour later, far longer than any other attempt in the last 3-4 days). Not a single problem.
I hate tech support...