AMD has posted a tweet on its Ryzen Twitter account showing what can be done with just one Ryzen Threadripper 1950X HEDT chip and four Radeon RX Vega 64 LC graphics cards. The builder of the custom desktop PC setup has called his system "RippinRed 2.0", and it also features 32 GB RAM, a motherboard from Gigabyte, and four monitors from Dell and Acer.
https://www.notebookcheck.net/AMD-fan-amazes-the-red-team-with-custom-build-PC-featuring-four-Radeon-RX-Vega-64-LC-graphics-cards.418579.0.html