I guess what I was trying to get at is that the thicker the copper plate is the better it will spread out the heat so that there is more surface area to create a higher delta T with the water.
There will be a upper limit for the thickness but I have never seen a waterblock with a half inch of copper at the bottom just to spread the heat out. If someone knows of one I'd like to see the results.
The radiator example was just for comparison.
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