With system software update 5.50 comes Supersampling Mode, a PS4 Pro-exclusive feature. This setting allows PS4 Pro owners to experience the benefits of their high-end systems on screens with lower-than-4K resolutions.
Supersampling works by rendering video at a high resolution (as if connected to a 4K TV) and then downscaling the output to the native resolution of the connected screen. The result is a sharper, smoother picture and larger in-game draw distances.