Okay thanks for the information. As I recall, when I previously had a 3500+ in this machine I noticed high temperatures. So I guess it is just reporting incorrectly. In any rate, I have been able to get it up to 2.4ghz running with Prime95. Tried 2.5ghz but it immediatly gave a rounding error in Prime95. Going to let it run overnight and then try for 2.5ghz again. Not bad for being a crappy 0551 and running stock voltage I guess.