Thanks for that info. As not having an Oculus rift I would not be able to factor that in how it will affect the system but from your anecdotal experience it seems that it puts more strain on the CPU whereas I would have surmised it would have affected the GPU more....
I'm no expert on that, but going by my experience with discovering the challenging resolution of 3440x1440 was still bottlenecked by the CPU, I'd say spend your money going over to Ryzen rather than a graphics card, but chances are you'll have to upgrade both sooner rather than later.
This recent thread might be a useful read in your case: https://forums.overclockers.co.uk/threads/need-help-deciding-on-gpu.18843786/