Gpu recommendations for pimax 5k super at highest fov

Hi, i have the pimax 5k super and was wondering what GPUs people recommend for the highest fov 90hz refresh rate i currently have a 2070 super and it is struggling to run certain games at a reasonable resolution at a decent refresh rate, so I’m wondering what others are running and what resolution steam, pitool and the game are running on your GPUs one game that struggles alot is Into the Radius for example? Any advice on gpu and settings is appreciated.

Steam: 60% resolution Pitool:1.5x resolution into the radius medium graphics settings for smooth framerate anything higher gets jittery.