The 5000 has a C/W of .23 at 4lpm where the 462UH (1/2" barbs) has a C/W of .26 at 4lpm. The UH version of the 462 is actually not a good performing block. The 462U block with the 3/8" OD tubing is almost as good as the 5000 as seen here: http://www.overclockers.com/articles655/index02.asp
Big reason. Water velocity. With the UH, the big bore holes eliminate the high water velocity to the base as occurs with the smaller hole of the U version.
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