What’s going on Cryptocurrency Universe, it’s The Bitcoin Miner here. In Part 5 of my 125 Orange Pi cluster build, I’m down in the crypto mining dungeon figuring out the power delivery system—because if you don’t plan power right, the whole “supercomputer” idea falls apart fast. I got my new rack shelves (16 inch and 22 inch) and another set of rails in, and I’m staging this rack so I can keep everything condensed. The goal is to fit the power supplies (and eventually networking gear) cleanly in the rack, with enough headroom so I’m not riding the edge on load. I’m repurposing a pile of power bricks from my old cell phone farm instead of buying fancy rack-mounted USB power, because I already own them and they do the job. The big rule I’m designing around is the 80% load rule—yeah you can push six devices per brick and be “fine,” but I’m going for max efficiency, so I’m planning five per brick and running 25 bricks total to cover the insane number of USB connections this cluster needs. I tested a few layouts and picked the one that actually works, even though it’s not my favorite because of airflow around the heat vents. Next up is getting the metered PDUs in and locking the final layout down.