At the 2019 Nvidia GPU Technology Conference (GTC), NVIDIA CEO Huang Renxun said their RTX 2080 graphics cards perform better than the GPU on next-generation hosts. As shown in the following figure, RTX 2080 is compared with the next generation host on the NVIDIA slide, and since it is not mentioned which next generation host it is, it can only be guessed that it is either PS5, or the next generation Xbox--Xbox Series X.
The RTX 2080 has been on sale for a year and a half, while the next generation of hosts will not appear until at least one year later. Before the new host is on sale, NVIDIA will launch RTX 3080 or even 3080ti.
Previously, it was rumored that the performance target of the next generation Xbox GPU was 12tf, carrying 16GB gddr6 memory, of which 13gb was video memory and 3gb was system memory.