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Running the pump to the block rather than the rad seems to help in my system, contrary to logic.
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Actually, it seems that your system is trying to prove the points that some people made in other discussions about pressure - running the block right after the pump will have a higher pressure in the block.
And no matter the size of your pump, I seriously doubt it makes a noticeable difference in the temp of the water. I don't have water-temp sensors just before/after my pump, but I do have them just before/after my block (and I think we all agree that an average CPU under load puts out more heat than a pump). I usually average between .5 and 1 degree difference in water-temp as the water passes through the block. I think when I get home I'm going to take one of my extra temp sensors and attach it to the tube just before the pump (and my pump is just before the CPU), then I can start collecting temps of water just before pump, between pump/block, and just after block - with both heat-sources combined I doubt I'll see a difference of more than 1.5C as the water moves through (and I don't think my flow rate is even very good).