> For example, some of my homelab servers use older AMD Athlon 200 GE as their CPUs, due to the fact that there are on board graphics and because the TDP is 35W, both saving electricity and also allowing me to use passive cooling (with just a large heatsink https://www.arctic.de/en/Alpine-AM4-Passive/ACALP00022A).

I have a server with a 3700x. I originally had a cheapo discrete AMD graphics card in it, but I ended up just yanking that and running the machine without any graphics card. Saves power.