I'm aware of this, though you have to remember that pressure drops in certain parts of the loop can absolutely KILL flow rates. Flow in the rads doesn't really matter. The rad will disipate about the same amount of heat at .5gpm as 2gpm. For a deeper explanation of this look at pH's work in the articles section. The two rads will dissipate the same amount of heat regardless of loop configuration. What you should try to achieve, for the sake of your waterblocks' efficiency, is the highest flow rate in your loop.
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