After having a IHS on my Dothan for a week here's what I've noticed:
The cpu idles about 2-3C warmer than without a IHS... but under load it runs 2-3C COOLER than naked... this can only be explained by the fact that it is making better contact now than before when naked. Plus my CPU already has 3 small pits and 4 or 5 hairline fractures on the core, ONE MORE heatsink mount may have been the "end" for my Dothan... this mod is a "lifesaver"

C