MacOS compatible?

You need a 2014 or later Mac mini to run macOS Monterey.

see > Mac Studio - Technical Specifications - Apple

Although if you have a base model 2014 with a SATA 5400rpm hard drive, you maybe better of holding back on Mojave or Catalina.

see > How to get old versions of macOS - Apple Support

The late 2014 models.

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