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Originally Posted by jman1310
if i understand the graphs right then higher flow rates will only help at higher airflow
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Airflow doesn't come into it. If your waterblock is performing more efficiently, then whatever it is cooling will be closer to coolant temp. Many waterblocks become more efficient as flow rates go up (and some, like the Swiftech 6000 series, don't change that much as flow rates go up - look at the performance curves - flat means water flow rates don't matter so much).
Also, just as a basic physics thing, heat energy flows more rapidly as the temperature difference becomes greater. So, with lower airflow, your coolant will be warmer, so less difference between this and your CPU, so the waterblock will be less efficient. On the other hand, the difference between your coolant temp and the air becomes greater, so your radiator will be performing more efficiently...