Overclocking-wise, getting the base-plate as flat as possible, and mounting the block as flat and as firmly as possible against the CPU, tends to have the most effect before the block's internal design comes into it. Addressing the mounting inconsistencies and base-plate flatness should be the first port of call for anyone who wants to assess the overclock potential of a design.
A casual observer attempting to predict visually which design allows for better overclocking is fraught with peril. There are a great deal more aspects to it than simply saying "block X has impingement", or "block Y has a thick base-plate".
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