I think it has under clocked Vega (less Cu then Vega but more CU then Polaris)
If PS4 pro GPU Polaris has 36 CU , with GPU core clock 900 mhz resulting on 4.2 terraflop, Then Vega will have 72 CU (double the Polaris CU). But Xbox One will have 6 terraflop then it's mean, Xbox One logically will have less CU then the Vega and will have similar GPU core clock speed with PS4 pro.
My prediction it will have 54 CU with GPU core clock 900mhz, resulting on 6 terraflop








