XP2600+ with a cheapo heatsink & fan running at 39 degrees C with a game running, motherboard sitting comfortably at 20 degrees C, graphics card processor running at 47 degrees with Arctic Cooling custom cooling-kit on...

Can't complain, and I've not even looked into Vapo/water cooling yet!

77 degrees is a bit on the hot side, for any CPU, though......not dangerously so, by quite a bit, but it is pushing it a little higher than comfortable.