your gpu!. Crossfire is not supported in VR at the moment, so you are only using one of the cores of your GPU, which makes it lowish end for VR.
I am in the green camp so I may not be correct, however, iirc individually each single core of the 295X2 is slower than a single 290x.
VR is a tough mistress and imo may reset the whole high end gaming PC, much like sony did when they released the PS1 (and sega with the saturn) (both of these made what were high end gaming pcs up till then look almost obsolete)
Incorrect. The current SteamVr Benchmark uses crossfire by default. He should be getting in the high 8s, low 9s. Single card would be netting him an 6.7 or 6.8.
Imski - make sure that no other processes are taking resources during the test as it is heavily impacted by background processes.