I have never understood these tests and experiments. Yet another pointless analysis for everyone who doesnt have a massive chunk of copper lying around or a smelting tool to make one.
When I tested my CPU prior to adding the monoblock onto it, I used a cheap Intel fan from the 2700k days, and it easily kept the 11900k CPU down in the 80s while I verified it works under load (not heavy load). The fan cost me £5, this copper probably costs 3 or 4 times that amount!
Are people that bored that they want to test multiple objects just for "s**ts and giggles"? Even if its passive silent cooling, I still dont see the point.