As an update to the ordering of components myth, the only difference between:
pump->cpu->radiator
vs
pump->radiator->cpu
is the additional pump heat as the water flows through the pump before it gets to the inlet of the CPU block.
The size of the difference is therefore a calculation based upon the heat that the pump adds to the water, and not the CPU.
For almost all pumps and blocks that are in common use, the difference is actually substantially less than 0.1C if the math is done. More commonly down around the 0.05C mark.
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