I have two old PCs I use as Servers, one old amd fx-6350 system as a NAS and a not so old 5900x with an rtx 4090 and an rx 7900xtx as my allrounder.

The NAS is just truenas without any modifications and a couple of HDDs

The 5900x, 4090 & 7900xtx I use for hosting several things:
> jellyfin - foss ...