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)
Firstly, there actually isn't much difference between server grade and gaming motherboards, like sure one might support ECC + IPMI and the other RGB + overclocking, but as far as compute goes, they are both effective motherboards.
Secondly, I don't think OP was going for a 'server' but more of just a workstation type build, so why one or the other?
Thirdly, why does it even matter? OP should be proud of their system whether you like it or not. Even if they are using it as a server, my first server was just some reasonably priced consumer grade parts and I never had any sort of stability issues with it.