I replaced my main workstation (3930k w/ triple HD monitors) with a 7980xe rig w/ triple 4k.
All of the machines work together over a local network to render images super fast. The main programs I use are 3ds Max and Vray.
This is my 4th build, but gave my old main rig to my gf because 6 cores isn't significant enough to justify buying another render license. If I were to start over, I would have 1 main rig with packed gpu render node, as gpu rendering is becoming ridiculously amazing.
If you are perhaps curious about the Wall-PC in front, here is the build log: https://imgur.com/gallery/Euknr
Setup was a breeze, but had so many problems with drivers and Windows 10 stuff.
Happy to answer any questions.