OK. On a good watercooling system you probably have on the order of 20-30°C between the true die temperature and the ambient air that's cooling the radiator. Of this 20-30°C, some is in the die/block interface, some is in the metal of the block, some is the delta-T between the surface of the block and the liquid, some is between the liquid and radiator tubing, some is between the radiator tubing and fins, and some is between the fins and air. If you take 7% of the portion that exists across the block, you're talking a very, very small number. Consider that aluminum and copper vary to the tune of ~230 to 400, or nearly a doubling of conductivity. Yet the difference between good copper and aluminum blocks tends to be on the order of 5°C.
And no, I didn't mean the difference would be 0.07°C. I said 0.07 * a few degrees C. Say maybe a final result of less than 1°C.
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