My MP 3,1 has been sitting offline since about this time last year. Have decided to upgrade to the oldest currently supported OS, and then put it to work consolidating / backing up my various external drives, as well as my iTunes, Apple Music, Apple TV media.
Running Ventura now, a few items started working again (audio output devices), and typing on this now on MR, I am amazed that this computer can handle modern workloads totally fine, and run with relatively low issues.
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Remember the 3,1 came out during the era of the first iPhone, and ran through the 3G period. You can't browse modern websites with those devices, and 2G / 3G cellular is mostly dead. With patching, the 3,1 still works in the modern world and that is dang impressive to me!
While I am set with an M3 Pro MacBook Pro, and M4 Pro Mac mini, and they both can run circles around my Mac Pro 3,1m there is something special about using older tower with terabytes of drives, and a discrete (even though dated) GPU.