Rx 6900xt and Pimax 5k+... Assetto corsa competizione FPS drops

Hi all… i have mounted 2 days ago my new RX 6900XT (i had 1080TI) and when i launch Assetto Corsa Competizione on Pimax 5k+ i have a lot of FPS drop.

If i have a moderate setting (Pitools SS 1,0 - SteamVR 100% and graphic options low) the FPS are good, 75/80 at 12-14 ms…

But if i change anythings the frame remain 70/75 at 18/20 ms BUT i see through my Pimax the image like 20-25 FPS

anyone have and idea to solve this problem??? It’s a bottleneck from CPU and RX6900 (i Have ryzen 3900XT, 16 Gb 3600 Mhz, 1Tb Sabrent M2, 850W Titanium Power unit) or it’s driver problem? or there are a settings who i don’t know???

Thanks all for the answers!!!

i thing nvidia is better in vr overall , but not sure

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i have 3090 i7 8700k 32g ram 3600 mhz and use pitool 1,75 and 32% steam vr res… its native 4k and running great steady 75 fps in pimax 8kx 3700*2100 per eye ish

[ConsoleVariables]
r.PostProcessAAQuality=4
r.TemporalAACurrentFrameWeight=0.1
r.TemporalAASamples=4
r.TemporalAASharpness=0.8
r.TemporalAA.Upsampling=0
r.Tonemapper.Sharpen=4
r.TonemapperQuality=0
r.TextureStreaming=0
r.VolumetricFog=0
r.RenderTargetPoolMin=350
r.BloomQuality=0
r.FastBlurThreshold=0
r.LensFlareQuality=0
r.LightFunctionQuality=0
r.LightShaftDownSampleFactor=4
r.SeparateTranslucency=0
r.SceneColorFormat=3
r.SceneColorFringeQuality=0
r.SceneRenderTargetResizeMethod=0
r.EyeAdaptationQuality=0
r.AmbientOcclusionLevels=0
r.AmbientOcclusionRadiusScale=1.7
r.AmbientOcclusionStaticFraction=0
r.AmbientOcclusionMipLevelFactor=0
r.TranslucencyLightingVolumeDim=24
r.TranslucencyVolumeBlur=0
r.ShadowQuality=4
R.DFshadowquality=1
r.Shadow.MaxResolution=512
r.DepthOfFieldQuality=0
r.HZBOcclusion=0
r.SSR.quality=0
r.SSR.MaxRoughness=0.1
FX.AllowGPUSorting=0
vr.InstancedStereo=1
vr.RoundRobinOcclusion=1
r.MotionBlurQuality=0
r.MotionBlurSoftEdgeSize=0
r.TiledDeferredShading.MinimumCount=10
r.Shadow.CSM.MaxCascades=2
r.RHICmdBypass=0
r.MipMapLODBias=0
r.AOquality=0
r.DistanceFieldAO=0
r.AllowHDR=0
r.OneFrameThreadLag=1
r.FinishCurrentFrame=0
r.Shaders.Optimize=1
r.Shaders.FastMath=1
r.CreateShadersOnLoad=1
r.OptimizeForUAVPerformance=1
r.MaxQualityMode=1
r.DetailMode=2
r.MaterialQualityLevel=1

[SystemSettings]
fullscreen=true

[/script/engine.renderersettings]
r.OptimizeForUAVPerformance=1
a.URO.ForceAnimRate=2
a.URO.ForceInterpolation=1
r.streaming.boost=0
r.Streaming.DefragDynamicBounds=1
r.Streaming.FramesForFullUpdate=1
r.Streaming.FullyLoadUsedTextures=1
r.Streaming.HLODStrategy=2
r.Streaming.LimitPoolSizeToVRAM=1
r.Streaming.PoolSize=0
r.UseShaderCaching=1
r.UseShaderPredraw=1
r.bForceCPUAccessToGPUSkinVerts=True

[Core.System]
Paths=…/…/…/Engine/Content
Paths=%GAMEDIR%Content
Paths=…/…/…/AC2/Plugins/FMODStudio/Content
Paths=…/…/…/Engine/Plugins/Runtime/Steam/SteamVR/Content
Paths=…/…/…/Engine/Plugins/Runtime/Oculus/OculusVR/Content
Paths=…/…/…/AC2/Plugins/ACShaders/Content
Paths=…/…/…/Engine/Plugins/2D/Paper2D/Content
Paths=…/…/…/Engine/Plugins/Developer/AnimationSharing/Content
Paths=…/…/…/Engine/Plugins/Editor/CryptoKeys/Content
Paths=…/…/…/Engine/Plugins/Enterprise/DatasmithContent/Content
Paths=…/…/…/Engine/Plugins/Media/MediaCompositing/Content

[/Script/WindowsTargetPlatform.WindowsTargetSettings]
AudioDevice=Speakers (USB Audio Device)

my ini fiile

r.TextureStreaming=0 my card is using 23.4/24.00 gb vram

and all texture is fully loaded

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thanks, i will try your engine.ini and setiings…

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