I am currently running a thuderbird 1400 and have upgraded the heatsink and fan and under several hours of 100% load (dvd encoding) the temp never goes over 54C. I am now about to upgrade the processor to an XP 2100 (the fastest my mobo can handle). So the question is will the fan handle the job? Im sure I read somewhere that the thunderbird 1400 actually runs hotter than the XP 2100, if thats true I should be ok and save myself some bucks!!