Disclaimer:
Runs a little flakey in my iMac = locks up 1/day to 1/couple of days. Sometimes better, sometimes worse.
Seems to run better in OS 9 (less lock ups), rather than OS X.
I have not tried to diagnose this (e.g. swapping ram out, cooling the cpu with thermal paste, reinstalling OS X, etc).
Plus, I'll toss in the original 32 meg SO-DIMM that came with the iMac.
I can take paypal.