The important thing it to report how temps were acquired and the range. If one has relative temps (I changed this part and noticed xx difference) then it can still be useful for them (or for others) to discuss their systems.
Sort of like if you use a normal Hg thermometer outside your window to decide whether you need a coat or not. Perfectly acceptable. If I used the same thermomter (with temps reported to 0.1C) to write a research paper on how climate change was affected by global warming then that is UNacceptable.
In theory, since the pump does add an amount of heat to the water, it would be best to go pump -> rad->block. With most hobby pumps it is a small amount of heat, and you may find that if you have to add a 90 or a lot of extra tubing to run it this way that the loss in flow rate affects CPU temps more than the extra 20W heat. Some are moving to much larger pumps nowadays, and they can produce far more heat (my little giant is 200W).
At any rate I can't imagine it making a huge difference (or perhaps even a detectable one) for most.
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