I'm running a decommissioned rack computer in my basement. It works good with some caveats and recommendations: * Buy a 2U server, not a 1U server. The 1U serv

I'm running a decommissioned rack computer in my basement. It works good with some caveats and recommendations: * Buy a 2U server, not a 1U server. The 1U server fans are VERY LOUD and very annoying. The 2U server fans are still pretty loud, but more tolerable. If you are in the same room, even the 2U servers can be annoying. * Check the CPU benchmarks (e.g. https://www.cpubenchmark.net/ https://www.cpubenchmark.net/). Older systems with older CPUs might not be as fast as you expect. * Check how much RAM the system supports and get as much RAM as possible when you buy the system. I had problems trying to add RAM sticks that had the same specs but the BIOS would not accept them because they were not identical (it apparently matched manufacturer IDs as well as timing). * Efficiency will be less than a new CPU; same or higher wattage with slower performance.