I have a dual socket R620 with 256gb RAM that I never turn on (proxmox) and another box with a single xeon 1518d (esxi). Collapsing both down to a repurposed Sophos SG135 (atom c3558) with 32g ram, 512gb sata and a noctua fan (proxmox). I already use another sg135 running opnsense. I run mostly lightweight loads anymore (HomeAssistant, netbox, unifi controller) so I really don’t need things turned on that have overkill horsepower. I have a separate file server that I need to upgrade sometime (old 4 core bulldozer amd) but it keeps chugging away.