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From your graph though, I would advance this theory: an increase in flow rate will generate better heat dissipation from the waterblock, but MUCH less dissipation from the radiator.
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Why? I see no reason that radiator performance must vary with flow. Perhaps you could explain your reasoning?
Heres my theory. Everyone can afford $17 for a heatercore (or a Blackice) that has 4x the cooling power they need. Therefore radiator and pump dissapation are not particularly important.
Furthermore the thermal resistance of copper is fixed. Therefore no matter how much you flow you can only approach a given effciency with a given design. Thats why more flow will eventually not yield more performance, but not because of radiator effciency.