BritishBean Itās an APU, CPU + GPU on a single chip. The GPU is more feature rich on XSS too, so includes Ray Tracing, VRS and other bits and pieces. Itās more the memory than the GPU.
@Gammerz OK, still not just at 1080p. X1X enhancements can be higher resolution textures, performance modes where fps is prioritised, super sampling via internal resolutions at 4K which when scaled down to a 1080p output provide a nice clean image. I think you just have to think of it as X1S -> XSS and X1X -> XSX.