Apple says it's vintage. It's a 21.5 in 2011 iMac w/ 32GB ram, 4GB AMD wx4150, 512GB and 1TB internal SSDs on a 2nd primary 2011 Thunderbolt Display running Ubuntu. Playing some
HOW TO: Upgrade The RAM to 32GB on a Mid-2011 21.5inch iMac - YouTube
Does the mid 2011 iMac (21.5") support 32… - Apple Community
4GB to 32GB RAM Upgrade Apple iMac Mid 2011 - YouTube