What I am saying is that the waterblock itself is a significant restriction, and will cause the pump to add a different amount of heat to the water for every single block tested. You can't account for this by testing the pump in the absence of the block; you can only hope to account for this by adjusting flow and monitoring it with a fair degree of accuracy. Bill might have some estimates on how much more heat a pump adds to water when throttled (actually I wager he does). The accurate measure of power into the system (from die and from pump) becomes a serious problem here IMO.
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