According to a new rumour, NVIDIA plans to release two GeForce RTX 3070 Ti cards in May, both with GDDR6X VRAM. Apparently, NVIDIA has developed 8 GB and 16 GB SKUs that can reach 21 Gbps. The GeForce RTX 3070 Ti is expected to launch in May with NVIDIA's GA104-400 GPU.
https://www.notebookcheck.net/NVIDIA-tipped-to-release-two-GeForce-RTX-3070-Ti-variants-with-8-GB-and-16-GB-GDDR6X-VRAM.529395.0.html