my CPU is constantly running at 70+ Celsius, and peaks well over 90 when I play games, even when it's not overclocked and no matter what game it is, even the old ones like Descent. Ironically, though, I never even have any problem when playing FSO...
and don't get me started on my video card...I literally burnt my finger on the circuit board once...that hurt for a while.
This has lead me to resort to tearing apart the chassis and placing a fan next to my computer that blows cold air on to my motherboard, which finally manages to shut up the annoying BIOS' heat alarm, which goes off when the CPU goes over 90 degrees, and that's guaranteed when I'm playing games.