Listed plainly and clearly within macOS code is the number of compute units each GPU will have: Navi 21 will have 80, Navi 22 will have 40, and Navi 23 will have 32. Assuming that each compute unit corresponds to sixty-four shaders, the GPUs will have 5120, 2560, and 2048...
https://www.techspot.com/news/86897-amd-radeon-rx-6000-gpus-revealed-macos-big.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/86897-amd-radeon-rx-6000-gpus-revealed-macos-big.html?utm_source=dlvr.it&utm_medium=blogger