Ok , heres the bascis. A higher flow rate means less time to lose haet in the rad BUT the water is in the water block for less time so it picks up less heat say per mililitre. This evens out roughly. With a higher flow rate you will get slighlty less heat per mililitre being gained by the water but your are increasing the amount of water going through the block. HIGHER FLOW RATE IS BETTER. I think the guy who said pressure doesn't matter is wrong. Just check with where you are buying it how much pressure your dealing with and what precautions to take.
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