The powerful ones are called epyc.

latest amd ryzen chip and with 4tb of ssd and 16gb of ram

Why would you call that “powerful”?

connect them all to one display

The X Window System was invented originally with this idea. It can even connect multiple machines to multiple displays seamlessly.

https://en.m.wikipedia.org/wiki/X_Window_System

It still works fine, but after most people have been using it only on 1 PC and screen, they abandoned it in favor of Wayland.

Nowadays even self hosters, the cream of the crop of all nerds ;-) usually prefer headless servers and only 1 PC with many screens connected to it.

…which is derived from SGML.