I think it was issue with SLI being enabled or this other line in the commandline.txt file that either NVIDIA experience or VORPX added to it. I didn’t go back and determine if it was SLI being turned off or this parameter being called out for the fix (or both), but one of the two might help someone else if they are also unable to get VORPX to load properly for a 8:9 resolution for GTA
Windows set to 1280×1440 +
(commandline.txt)
-borderless
-width 1280
-height 1440
-ignoreDifferentVideoCard <—- not sure where this came from?
Works great now other than some micro stutter when driving fast and turning my head (single 770 card is around 70-80% utilization, so not sure what the bottleneck is for the stutter. Outside of the obvious pixel density limitations of the rift (screen-door), its an amazing VR experience. Best during dusk on a motorcycle.