I use it @1440p and mostly Ultra settings (clouds only High - they cost a lot of frames). Fan is on the whole time, but I don't care in this context. Frames/s are good, but only between 20 and 30 in areas like New York (still flyable). 4K is frame wise no option. In general at 1440p GPU limited with my Mac (i9, 5700XT) and the bootcamp display drivers are probably not perfect yet. All in all still a lot of tiny bugs in the sim, but the visuals compensate for that. Sadly currently only DirectX 11 optimised, with DirectX12 it would probably use the hardwares potential much better.