Netkas is wrong about it. Dual GPU setup will not work on crossfire cards, but with LiquidVR, if you have dual GPU setup two cards will work on two displays. One GPU - one Display.Oculus won't be working on the nMP. #60
It will be working on the cMP. So that's an entire genre of professional media work that the nMP wont be doing.
I wonder if these guys dusted off their old cMPs or just ditched the nMPs for PCs to do their work:
http://www.thedailybeast.com/articl...-oculus-rift-virtual-reality-movie-henry.html
Even if you will add latency on AMD GPUs together for Crossfire you will end up in 38 ns range, whereas on single GPU setup with Nvidia card you are on 57 ns.
But again, Dual GPU setup is not exactly crossfired under VR.