Quote:
Originally posted by MadDogMe
I though the wall thickness was for structural strenght and the secondary impingment was 'incidental'?...
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Far from it.
The second inpingement is what allows the baseplate to have any kind of structure, with the remaining copper there. The "incidental" really, is that if you use a 3/8" plate to start off with, you are left with a good structure that should remain integral, under the clamping pressure.
These remaining bits of copper act as fins, and the second inpingement allows it to function optimally, with minimal thermal resistance.