Redditor That-Desktop-User posted their DIY solution on the HardwareGore subreddit. The copper cylinder is being used to cool an unnamed Intel Core i9 CPU in a fully open-air system.
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https://www.techspot.com/news/97505-8-pound-copper-cylinder-can-cool-cpu-pretty.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/97505-8-pound-copper-cylinder-can-cool-cpu-pretty.html?utm_source=dlvr.it&utm_medium=blogger