My Main-PC is now 11-12 years old, it's a HP Z600 upgraded to the max, buy'd a second CPU for 15$ additional 24GB ram (now 48GB) for like 100$ and a new GPU for 350$ some time ago, and it still runs like a champ.
Also got one HP Z-something (can't remember) PC, a bit later with a Xeon CPU (or two?) with 24 GB RAM. Otherwise great, but it's very power hungry, heats up a room in a hurry.