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Originally Posted by davidzo
Because the idletemp is quite ok it can't be the pump because it has a constant flowrate. The idletemps would be worse if it was only the pump.
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Saw your note about the plumbing, so I take it when you wrote this you were under the impression that the loop was serial. Anyway, I doubt your logic. Think about a variable speed CPU fan. At its lowest speed at idle CPU the temperature is fine. Why then at load as temperatures climb do we increase the fan speed? By your logic a constant flowrate is ok, so we should never have to increase the fan speed. With water cooling we generally don't vary the flow, so we've got to have enough to deal with the load.
The key telling point was his CPU block was too hot to touch and his FluidXP was warm. These are very innacurate measurements, but they tell a story. Based on his untuned parallel loops and obvious flow problems as a result, I am not willing to pan the Zalman yet.