The tops of the inside fins are aligned with top plane of the block.
One more thing there is a difference in optimal thickness of the base if you're cooling smaller cpu (like duron or in the future thoroughbred) or larger (Tb,AXP), for smaller ones the thickness should be bigger, so the heat can spread through the active part of the block. So I should find optimal thickness for both kind of cpu's and then some compromise between them.
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