Bill, you might take into consideration the mechanical factor as well.
When one mates a HS or a waterblock with the CPU, quite an amount of pressure is applied. Since we're dealing with metals, i'm 100% sure that they 'flex' to a certain point.
With AMD CPUs, i think only the CPU core will flex (the HS will too, but to what amounts to zero).
With newer Intels (P4), a waterblock with a rather thin baseplate will maybe flex just the same (approx.) as the P4 IHS.
Of course the amounts have to be checked out. But in the case of 'imperfect' cores, the mechanical pressure of the mounting system can compensate, as long as the TIM is squished out properly...
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