Quote Originally Posted by ryboto View Post
that sucks. Weird, my Ultra 120(4pipes) could passively cool my 89W Opteron with a 200mhz OC(2.2ghz). Temps never reached more than 55C. I've since switched to an AM2 chip, and until last week, was using the Ultra 120 passive, but I've switched to the HR-01 Plus. It cools the X2 4000+ perfectly fine at stock settings passively, but I'm on an undervolting kick.

edit: strange temps you're seeing. My friend has an Ultra 120 Extreme installed on his B3 Q6600, and when he SMP folds the chip only reaches 44C. He's got one fan mounted on the U120X in a pull position, and the rear case fan acts as an intake feeding fresh air from ~ 4inches away at 900rpm to the other side of the heatsink.
I can tell you whats going on, first of all you cant compare an opteron to a B3 Quad core, these things produce tremendous heat, AMD's run naturally cool, so thats only expected. As far as your friends quad core, im gona go out on a limb here and say that when he SMP Folds, hes not using all 4 cores. The program is probably not designed to utilize all those cores, probably only two, when he runs the program, have him check and see what the CPU stress is on each core, id be interested to see that. On all my tests im priming all 4 cores using Prime95, so its maximum heat load.