Cathar: No I mean that if, in a system, the -U block resulted in a flow rate of ~2 lpm while the -UH block resulted in a flow rate of ~6 lpm, then the -UH would appear to be a superior block. It's illustrative of the difference between wb design and system design.
Voodoo: It is one of the fallacies of water cooling that big barbs and tubing means better temps. Forced convection is proportional to turbulence, and turbulence increases with water velocity. Think about the curves that Bill posted in those terms At any spot on the x axis, flow rate is the same for both blocks. NOT water velocity, however. For the -U block, the water is travelling at a higher velocity because it is going through smaller fittings and a restriction at the base of the inlet. The -UH block has big barbs and no restriction at the inlet so water velocity is decreased.
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