You have to be careful and read the release notes carefully though. Our iMacs are 2011 and have the AMD 5xxx & 6xxx GPUs. They are pretty much useless with any of the newer operating systems because of the lack of any GPU acceleration. The 2021 Tins has with the nVidia GPU is ok.
Yes, I could upgrade to a newer GPU, but looking at Gumtree it's about cost neutral with buying a slightly newer (and still supported) model second hand.

