Stack O' Macs
If you ever feel the need to harness the horsepower of 160 Mac Mini's (that's 640 real cores) and shelve them in one rack, you can refer to this article on Hackaday.
HackadayAn array of 160 computers is going to throw a lot of heat. To provide sufficient airflow, [the builder] built a custom cooling door out of four car radiators fans, connected to a 40A DC motor controller. This was all integrated into the door of the rack.