AMD has introduced the Radeon Pro 5600M GPU for the Apple MacBook Pro 16-inch. The Radeon Pro 5600M is a Navi 12 GPU with 40 CUs, 2,560 SPs, and features a multi-chip design with 8 GB HBM2 memory. MacBook Pro 16 configurations with the Radeon Pro 5600M will have a US$700 upcharge.
https://www.notebookcheck.net/Navi-12-based-AMD-Radeon-Pro-5600M-with-40-CUs-and-8-GB-HBM2-VRAM-will-be-available-in-the-Apple-MacBook-Pro-16-inch-for-a-US-700-upcharge.470162.0.html