Just built a new computer maxed out everything except for RAM and the GPU.
I had 32GB of lovely 8GB DDR4 1Rx4 ECC'd Server grade DIMMS (stable and responsive). My plan to go crazy with 2nd hand server RAM went balls-up when turns out my over the top motherboard doesn't support 1Rx4, bloody brilliant! So stuck with a spare 4GB stick for now.
The GPU is just a spare one i have laying around (got 6 GPUs, 4 in computers). I will be swapping my old rig that has a Radeon 550 (equivalent to a GTX 1030, same gen as well)
So here is a lovely screenshot of my bodged computer, eith a top of the line CPU, motherboard, with only 4GB of RAM and a 9 year old GPU (and a Free Speech Flag to top it off)
My gaming motherboard with celeron processor is ticking flawlessly in my home server :)
My home server is a HP prebuilt desktop built to get abused in scools with a AMD (A4-5000 APU) Mobile CPU in it. It came with a shitty fan that rattled but once i replaced that fan with a Bequiet (and forced a normal fan socket into the lovely HP proprietary fan header (i did check the pins were the same)) it is almost silent (perfect for the bedroom even though PSU fan is a bit louder than i would like). Very low power (~40 Watts) with three spinning disks.