2560x1440 is my monitor's (Asus pg279q) native resolution and desktop resolution. When I start the game, the highest resolution I can actually pick is 2804x1577. I never had this problem w/my old, trusty, crusty 1080ti, it only became a problem w/the 4090 (thanks Nvidia!). Directly modding the config files made no difference either. It's lousy because I finally have the necessary graphics horsepower to run this game at a much higher resolution w/SSAA.