Yes indeed offtopic...
Anyway we were at manufacturing and measure differences that could make such performance difference.
I am still waiting for bruce to tell us about the differences... if there are any other than machining.
I was making some tests in past about fins and 1mm diffeences in fin height could make a difference about 0,01 to 0,02 C/W and if the chanels width is wider that could mean lower pressure drop, but could mean lower water speer through channels and lower convection (heat transfer from copper to watter).
:shrug:
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EK Water Blocks
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