Haven't you noticed in review Supreme HF even with most restrictive plate P1 is less restricting then EK Supreme / Apogee XT / Heatkiller 3.0 ? Try mouseover on Waterblock Comparison chart. So not only you'll get better temps, but more flow overall in loop. If additional 3.5 degrees better temps are worth buying new block is different question though. If you are happy with current setup, i see no reason to spend extra money. Maybe in next project?(and at that also change D5 to D5 vario or even DDC 3.25)
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