No, but moding an Sk6 (or even a cheaper Cu sink) into a waterblock wouldn't be too difficult. Nor too expensive, at least not compared to the Maze2 or the Silverblocks. I'd think if the performance was there people would be doing it.
Afterall they go so far as to make silver blocks that cost 2x as much as Cu for a 5% increase in thermal conductivity.
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