sadly there is a huge difference in performance from 4080 to 4090 and specifically in VR due to the high pixel count and target refresh rate of 90Hz. Barrel distortion calculations making for larger fields of view to calculate over 2D 4K etc. Based on the target of 90FPS even the 4090 doesn’t average much over 100-110FPS in 2D. I bet you 4080 looks amazing in 2D. I play in 5120x1440p on 49" ultrawide for 2D and it’s butter. Going to Reverb G2 V2 with HAM removed I get to see the most I can and the 4090 keeps up with all movement. I agree VR is pushing every limit it can on CPU and GPU. There are VR games less CPU bound and work incredibly well. This is the curse of MSFS.
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