fhorst
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I own the WW, and it's nice, but I hate how it restricts my water flow.
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The heat transfer of a design, all other things being equal can often be roughly correlated with pressure drop. For example, heat trasnfer is aided by high liquid velocities, which in turn lead to high pressure drops. Thing like nozzles and whatnot will restrict the flow, but at the same time aid heat transfer.
More often than not, the recommendation to have a high water flow is for the sole reason of creating turbulence within the waterblock that aids heat transfer. It's not the high flow per se that is desired, it's the turbulence that it creates. Restrictive designs like the WW are designed to maximise turbulence even at low flows, i.e. they don't totally rely on the high flow to create the turbulence but rather create their own added trbulence as part of the design.
So having a lower flow through a block like this is nothing to worry about.