https://wccftech.com/amd-radeon-rx-6900-xtx-graphics-card-feature-18-gbps-gddr6-memory-increased-clock-speeds-navi-21-xtxh-gpu-rumor/

AMD is allegedly working on its fastest Big Navi 21 GPU-based graphics card, the Radeon RX 6900 XTX. The new information comes from a slide that has been leaked by CyberPunkCat which states that the card will feature faster memory and clock speeds.

The AMD Radeon RX 6900 XT currently has two variations, a standard variant that features the Navi 21 XT GPU and a binned variant featuring the Navi 21 XTXH GPU. Both of these variants are known as Radeon RX 6900 XT. Based on the new rumor, AMD could be working on a third variant that will combine the Navi 21 XTXH GPU with faster memory, allowing for faster performance in gaming that will surpass NVIDIA's GeForce RTX 3090.