I am having troubles to get some AAA Titles to work in the Rift DK2, because of running a Single AMD R9 270X GPU.
Framerates just too bad, cant achieve solid 74 FPS on every game i want to try.
So i thought maybe someone could get a hit on this thread, who has already tried running AMD R9 Series in Crossfire with DK2.
I know what ppl say about SLI and Crossfire for the DK2 in the past. It was just bad optimised. But i cant find any young threads about VR and CF recently.
It´s not worth upgrading from a Single 270X to a Single R9 290X or else until CV1 is released in my opinion. Because CV1 will need SLI or Crossfire to get the most out of it , cant even imagine a Single 290X will keep steady 90 FPS. But indeed my thought is to buy another cheap 270x to keep steady 74 FPS on my DK2 right now ( running medium to high settings without Antialising). I am addicted to VR , dont want to play without anymore !
xfire and SLI still introduce at least 1 full frame of latency. That might still be better than your current experience, but it will be suboptimal until the "liquid VR" and "gameworks VR" solutions are implemented. Both AMD and nvidia have been talking for nearly a year about implementing VR tech into their drivers. So far nothing.
But from my understanding, getting another , cheap 270x will grant me at least a boost in FPS, which i absolutely need right now in first instance, but having a latency issue as well, but this may not be as recognizable as having 50-60 FPS.
For now i am happy with getting solid 55 FPS. I avoid making fast head movements, so its still playable for a Genre like Racing or Flying.
I don't know about Crossfire, but for SLI I can say that practically no games/apps benefit from SLI in VR. Assetto Corsa is the only one I've seen that does. And, any game that runs in direct mode is not usable (massive flashing) if it attempts to do SLI. It's necessary to manually disable SLI for such games in the driver settings.
So, in my experience anyway, "extra latency" is not the problem with trying to use multiple GPUs for DK2 right now. The problem is that it doesn't improve your frame rate. At all. (Except in Assetto Corsa.)
This should change dramatically if/when developers take advantage of the multi-GPU features of Liquid VR and GameWorks VR.
Again, I can't speak for Crossfire, but for SLI the problems do occur for games that have SLI profiles. Those games can get a nice benefit on a monitor, but then nothing in VR. One problem is that games easily end up being CPU bound in VR due to the scene needing to be rendered twice per frame. SLI/Crossfire does nothing for you if you're CPU bound. This could be less prone to occurring if the two GPUs being used are weaker ones. Even so, you still have the problem where SLI doesn't work at all in direct mode, and direct mode is the future.
