Attached Link: http://www.thecardcooler.com/shopcart/CPU_Cooling/cpu_cooling.html

It's been a long time since I wnet throgh the heat thing, but I seem to recall that mine was crashing at around 40+ but I'm not sure. How hot does it get if you do a long render in Bryce? You might want to check with these folks (link). I got a GlobalWin cooler and haven't had any heat related problems since then. I also got an extra case fan as well just to be safe.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken