We tried ~50 VR new games on retail version RTX2080/RTX2080Ti with Pimax 5K+ and Pimax 8K recently followed some optimization and new findings. the overall performance is very well with high visual quality. so we got confidence that 2080Ti match with Pimax 8K and 1080Ti/2080 match with 5K+; By adding ASW and 72Hz/65Hz mode in the future, both headsets have the high possibility to match even lower video card.
The main reason why 8K need more demand than 5K+ is: 8K need rendering higher quality to do the compensation for the sharpness. with rendering quality set to 1.75 in the PiTool and the newly tuned gamma, the overall sharpness is competitive with other VR headset.
But the sharpness of 5K+ is still the best one in current VR market. better than vive pro and much better than others.