I no longer use this computer so it's time for it to go. Mac officially supports this computer up to Catalina, but with a bit of Google, there is a very easy way to get it to run Big Sur. Currently, there is a fresh install of Catalina. This computer was used as my in-house server for caching apple updates as well as an HTPC with Plex. * Intel Quad-Core i7 2.6GHz CPU * New thermal paste on CPU * 1TB Apple Fusion drive *4 GB RAM installed in the upper slot * Fresh install of Catalina * Power cord The lower memory slot is not working so the maximum that can be installed is 8Gb in the upper slot.