For you case, I am providing following, as they are cheap.
you can find some second hand parts.
MB SuperMicro X10SRi-F, 300$
CPU XEON E5 2678V3 120$, 12Core24Threads
RAM 128GB RAM 400$, 32GB DDR4*4, 100$ each
A PCI16x to 4 8643 split card, 100$ or less
U2 SSD, P3605 1.6TB, 250$ each, 1000$
any...