Quote:
Originally posted by Axly
Why should a waterblock be so large?
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Heat spreading.
I would expect that for an 80sq mm die a 50x50mm wb with a 4mm bp to give lower temps than a 15x17mm wb (of any thickness) for Heat Tranfer Coeffs(water to bp) below ~80,000W/m*m*c .

The problem is determining the Heat Transfer Coeff from the water to the the bp.Some of my guesses(using Kryotherm):