With the UH Swiftech drilled out the entire area of the inlet and outlet and put large (1/2" NPT) threads in. 1/2" NPT refers to the size of the fitting, not the size of tubing used. 1/2" NPT is sufficient for pretty large barbs and hose (you can get 3/4" barbs that are 1/2" NPT and maybe 1").
The issue here is that part of the reason the MCW462-U performs well is that there is a "nozzle effect" caused by the ID of the inlet being reduced. What is meant by this? Volumetric flow rates (gallons per minute or whatever units you like) are constant throughout the loop, but at any point water velocity may be affected by surface roughness, tubing diameter, or other factors. By having a drop in diameter right at the inlet, water velocity is increased as it hits the center of the block. Water velocity is directly related to turbulence, so when the higher velocity water hits the bbaseplate then cooling is improved. So at least in theory, the MCW462-U should perform better than the -UH for a given volumetric flow rate. That is why I suggest that you just stick a piece of copper pipe into the -U as a barb; use bigger tubing than Swiftech provides to reduce overall flow resistance and keep the flow rate high so that you can get the most benefit from the "nozzle" design.
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