meh, doesn't matter they are all poorly designed and do not maximize cooling potential to what it should be as they create hotter parts of the chips other cores with these poor designs. the intakes and exhaust and internal cooling fin structure is all wrong, even automobiles have better designs for engine cooling.
i'm not even an engineer and i already know of a better design with less flaw and more utilized cooling and flow.
seems there is only one way for this liquid cooling guys to understand flow technique dump liquid in one side extract opposite side.