I'm running an R9 290 Crossfire rig and I when I enable a CCC profile to force Crossfire, I set it to 1:1.
Game runs like crap. Lots of stutter- almost unplayable near stations.
Tried disabling Crossfire altogether (i.e. not just on the system, but for the E

profile too). Frames jump 20-30% at least (can't see FRAPS in my OR DK2).
Frontier, you design a game that works beautifully with Oculus Rift, knowing that OR requires a mad powerful computer build, and then ... fail to support Crossfire.
I really hope there is a good reason for this. I have seen absolutely nothing whatsoever from anyone at Frontier even mentioning that Crossfire may (again, I am told ... it apparently worked once?) work at one point in the future. No comment either way (i.e. 'we're going to implement it' vs 'we have no plans to implement it').
I have been using dual GPUs now for the better part of ten or twelve years; this is not a new technology.
Not supporting it just ... leaves me speechless.