The block isnt a very thin based block. 3/16th inch I beleive, and all those pins all across the block do help with performance. Thats where the some what thicker block base comes into play. If it was too thin then yeah the outer pins wouldnt help but its a balance of base thickness vs surface area and taking into account copper's thermal resistance. Yes, a very simplistic explanation but the mcw-6000 shows a thicker base waterblock can perform very well.
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