The Nvidia GeForce RTX 3080 Ti is now speculated to come with 12GB of GDDR6X VRAM and 10,240 CUDA cores. Its 320-bit memory interface will allow for 730Gb/s of memory bandwidth, identical to that of the GeForce RTX 3080.
https://www.notebookcheck.net/New-leak-says-that-the-Nvidia-GeForce-RTX-3080-Ti-will-feature-12GB-of-GDDR6X-VRAM-and-10-240-CUDA-cores.518561.0.html