[watmough]

As much as love Z620's in particular, my experience of a used one wasn't that great. In particular, watch for v1.0/v2.0 motherboard versions that prevent you from using the faster Xeons, and in general, the model seems to suffer from power supply problems. Just as I got my dual-processor 64Gig Z620 working under macOS, the 2nd processor daughterboard quit. Similar experience on my work Z620 at the time. Exact same failure. Better just to reset and build the fastest thing you can afford. My fast box runs a Ryzen 9 5900x and is 4x faster than my 2019 Razer Blade 15" for building the software I work on.