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I don't think we'll see any differences between small and large diameter hosing in 5, 6, or 7. Yes there are "sweet spots" for some rads but I'm ignoring that
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The sweet spot is an accident. Higher flow is better for radiators. Flow is restricted by small tubing. Thus, 5 is a concern with smaller tubing.
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So far, Cathar's whitewater and cascade designs appear to do this the best. the greater the water velocity (within reason) the better they transfer heat to water. The larger ID systems seem to all move greater volumes of water than the smaller ID systems (duh!) - and the greater volume gets translated into greater velocity in the water block. BUT I would guess that there's an optimum velocity, so a block "tuned" for lower flow might indeed perform better at low rates than, say, a whitewater at the same low rates.
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You guess wrong. Well, I suppose that the optimum velocity would be infinite metres per minute, but that's irrelevant. A WW is tuned for a 1048, is it not? Generally, though, something is best for what it's tuned for, so you're right in that aspect.