Long story short.
The SLI/Xfire was always a read headed stepchild of game dev world, and it started to be viable around the 2012 with the 600 series. Then the NVIDIA went "frack it, we do it ourselfs" and made automagick drivers that could essentially force the AFR SLI to work, this was useful because one of their flagship card, 690GTX was essentially SLI on one PCB. So what NVIDIA (and AMD) did was essentially alternated the draw calls between the cards and thus increased frames because you could start rendering next frame before old was complete in alternating manner. And you could do this with essentially same memory data so the game did not need any kind of coding done to enable the AFR. All could be done with existing resources.
This, however never really prompted the game devs themselves to do anything to help the SLI or Xfire in any way, and as a cost cutting measures, they often did frack all to help GPU manufactureres, rationalizing it by saying that majority of the market is on single GPU and that we just simply DGAF about the few enthusiast out there.
This attitude, ofc, wont fly for VR market, where the device itself cost, in some part of the world, up to 900 euros. If a game fancy itself a VR title, it better goddman have the VR parallel GPU support or it will be dropped faster than a 5 dollar working girl in Bangkok. Simply because the parallel GPU rendering offers almost twice lower latency than single gpu regardless of how super powerful the single GPU is. This is because the real bottleneck is when CPU needs to access same GPU twice to render stereo scene. Even two old 680gtx's in SLI will laugh at single 970gtx when it come to latency when it comes to VR if the paralelisation is enabled.
So if a game title wants to present itself as a "forefront" of VR, it better damn well support all the modern VR API's that enable smooth experience.
ED will be under roasting fire in the coming months when all the people who got VR will run in to ED's incompetence/greed when it comes to enabling parallel GPU usage.
This said, if you own a VR headset, vote with your wallet and do not spend any more money on the Elite until your VR hobby is actually supported by the ED full heatedly and not by a half band aid shortcut methods. I
