The RX 6900 XT will deliver clock speeds over 2,300 MHz with 80 CUs and 16 GB of GDDR6 VRAM, according to a new leak. Four other cards will make up AMD's 'Big Navi' lineup, as will AIB cards that will venture to an eye-watering 2,577 MHz.
https://www.notebookcheck.net/AMD-s-Big-Navi-Radeon-RX-6900-XT-will-challenge-the-best-of-the-NVIDIA-RTX-30-series-with-80-CUs-16-GB-of-GDDR6-VRAM-and-over-2-GHz-clock-speeds.498788.0.html