Lafiel on 28 April 2015
the most obvious differences between the PS4 and the X1 is the former having a larger gpu part with 18 compute units (= 1152 shader cores), while the X1 has 12 (= 768 shader cores)
additionally the PS4 gpu has 32 raster operations pipelines, while the X1 has 16 - those play a big role in outputting the picture the gpu rendered and according to several tech forums with 16 it's quite a bit tougher to achieve native 1080p output
