To clarify this, flow doesnt produce heat by itself (yeah, water friction against tube walls exists, but produces nearly zilch compared to CPU / Pump / etc.)
To get a high flow you need a high powered pump. A 80W pump will dump about twice as much heat into the water than a 40W pump, maybe more if it's not rated for high head. So make sure the rad can handle it, and waterblocks profit from the increased flow. Or else you get those dreaded diminishing returns.
(to make a broad comparison, if you put a more powerful engine in a car you must modify the transmission, maybe the gearbox, stiffen the chassis and improve the suspension and drive train.. or else...)
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