I did the same thing last year, only to break apart the server-gaming rig into two separate machines again last week. The reason being, my server needs to be on all the time, it serving some stuff and seeding Linux ISOs and whatnot. At the same time, my GPU - the mighty 3080 - was idling at around 30 watts and my CPU - my precious 5800X3D - was power hungry too. Obviously that's just a few bucks a month, but it adds up when it's constantly running. Swapping the GPU and CPU out for a Ryzen APU (5700G) saved me 30 watts + whatever my 5800X3D was idling at.