mine was running at 82c, still worked fine.
the core temp has alot to do with it.
i have a new computer now, havent bothered to check the temp on it.
i had the old computer last week, its even hotter the weather now.
i was holding a mini LAN party for the last 2 days.
7 PCs, plus a small-ish room with a very small window, with this very hot weather... was crazily hot. bit uncomfortable really. i much prefer cold weather.