https://www.techpowerup.com/304380/4-kg-literal-hunk-of-copper-cools-a-core-i9-processor
 
An 8 lbs (roughly 4 kg) solid cylinder made of copper was used as a fanless heatsink to cool an Intel Core i9 processor. This isn't a heatsink in that it's made of extruded copper, but a literal hunk of copper that is used as raw material. The metal is both extremely malleable and ductile, so it's shipped in such cylinders. The best part—the contraption is surprisingly good at the job, with That-Desktop-User, the Redditor behind this feat, claiming 35 °C idle and 80 °C load temperatures. The processor is essentially a heat-source that's trying to heat up the entire block of metal (with much lesser surface area for heat-dissipation than a real heatsink), which is how temperatures are being held at only up to 80 °C.
 
This is interesting. I feel that if a fan was blowing air across the copper the temps would be even better. 
 

transdogmifier
I think making fins in the cylinder and putting a fan on it would help even more....

And then it becomes a proper heat sink and not just a hunk of copper................
I think the point was to see if just a hunk of copper would cool a i9 CPU.