Your question is best answered by Bill, but I'll say that he has made an attempt at quantifying the resistance of the TIM joint so that the actual differences in block performance may be better approximated. The main point I was illustrating above is that the block's conductivity is only a portion of its total thermal resistance. The overall block performance is dictated by both its internal resistance (conductivity, material, and "internal" geometry) and its convective resistance (surface geometry). A good block design balances these two.
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