I agree that the IHS is somewhat of a problem for a few SD Fx55's. My 55 (and YES it is a FX55 - just check the link in my sig) on air runs up to about 50+C @ ~1.42Vcore. But the problem with the IHS is more apparant when I put the cpu under my autocascade. My core temps ~-28C while a temperature probe mounted to the IHS reades -51C. With a difference of 23C, it seems to me the IHS isn't making good contact with the actual cpu....