For your situation, I think the idea is a good one. For joe-blow looking to cool a CPU (and maybe a GPU) it is probably overkill. You realize that you don't need too much flow through the radiator to get "enough" cooling out of it. You also realize that getting higher flow through your blocks is desireable. If you only had one or two blocks, this whole thing wouldn't really matter.
To me the top two hitters here are:
1) Only one pump required. Fewer devices means fewer things to fail.
2) Lower system resistance. Means more of the pump head is available for your multiple blocks.
Being an engineering gearhead, you also get item 3, which is something additional to play with and tweak. The value of this can't be overestimated for true engineering types.
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