Ok, I see your point.
Core to TIM, TIM to baseplate, baseplate to coolant.
I'll give it a shot. Let's say we have a coolant temp of 30deg C, and a core temp of 40.
Core to TIM: that falls in the "complex" for me, because I don't know the thermal properties of the core material, nor how the surface is finished. If the core temp reads 40, I'm going to guess that the core surface is 42 (whoever said that the internal diode gives an accurate reading?). At the TIM, I'd guess 42, since it doesn't dissipate any heat, except to the waterblock.
TIM to bp: from 42 at the TIM, the baseplate won't be very far either. depending wether the temp is measured at the bottom of the bp, the temp should be closest to the hottest point (41.9). (a tiny bit of heat dissipated to air?)
bp to coolant: The copper and coolant should be different, as there would otherwise not be any heat transfer to the coolant. It doesn't seem to be difficult to get the copper hot, but much harder to get the heat into the coolant. In other words, the most amount of resistance in heat transfer, is in the copper to coolant transfer.
(ok, now I have to try mercury cooling!)
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