BigBen2k:
You trivialize understanding the true power (heat load) that is placed into the baseplate of the waterblock. Secondary losses, variation in the applied voltage (better use a line smoother of some sort), and flaws in the insulation become a huge issue. Trying to get the accuracy of the temperature measurements to where you want them is useless unless the input heat can be quantified equally well. Contrary to popular belief ("just use a really hot CPU"), the confidence in the numbers that come from a resistor or a CPU doesn't improve (IMO) with a bigger heat load. Instead, the likelihood that differences in temperature readings can be seen by your equipment may improve. This seems like a good thing, but if the temeprature difference is due to fluctuation in the house's power (maybe someone turned on the blow dryer in my apartment) then it can lead to very incorrect interpretation.
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