The winner of the Intel Extreme Rig Challenge at Pax East 2017 was no joke; a fully functional dual VR rig. That means two completely separate systems with their own liquid cooled GTX Titans and 7700K CPUs in one case. The only component these siamese twins share (other than the case) is a monster 1600 watt PSU to keep them juiced up. A custom player 1/player 2 paint job and LCD panel make this co-op VR system one for the books.
Check out Origin PC's Genesis X2 build in action-