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Journeyman III

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!!!