So I was in AMS2 yesterday and trying to tweak the settings while on Bathurst track in the 2020 Stock Cars, with AI on the track.
I had 120hz mode on and i was getting decent fps around 80fps. It looked fine but i felt like i could lower to 90hz mode, and push the graphics more to get it to stick solid 80-90fps.
Instead, when I closed the game, closed SteamVR, reset pitool from 120 to 90hz, went back into steamVR then AMS2, and when i got back on the track, the fps was terrible. fpsVR was showing me 40-50’s for the fps.
I guess I’ll have to try that. It was the strangest thing though. Drop 120 to 90hz, and the fps dropped the same proportion in game. It made no sense.
Then the next issue is that when i tried to push the graphics any further, i get vertical lines flickering in the menus, and if i pushed the SS, or other graphical options even higher, then those vertical lines would flicker in game along with the menus and became unusable… but the GPU is using 70-80% only, so there’s definitely more headroom.
I tried the GPU Catalyst option at 1.0, 2.0, and 3.0 - at each level, i saw the gpu usage percentage go up, but then the flickering would start.
Its not very strange, i note that you arent posting your rendered steamvr resolution, how about you check that? 120hz has a lower FOV (even medium vs medium is a lower rendered res) which is then multiplied by the parallel projections.
If you run 90hz at a wider fov then multiply a higher rendered resolution by PP is going to result in lower performance if you push more pixels around.
Hey Tim! Ye I saw on Reddit another guy mentioned the resolution might be different on 90hz normal FOV, and 120hz Normal… I will check next time im tweaking the settings. Thats the only thing i can think of causing the drop in fps performance.
Is it possible that this is related to Vertical Sync? A faster refresh rate would allow for less time to be spent waiting to display the next frame. Perhaps changing the “Virtual Reality pre-rendered frames” video driver setting to 2 would improve the FPS (but will introduce a small amount of lag).
If this is true, then using a higher framerate has an advantage that I never considered before.