https://wccftech.com/nvidia-geforce-rtx-3070-ti-could-feature-8gb-and-16gb-gddr6x-variants/

NVIDIA is preparing an RTX 3070 Ti graphics card for launch in May and according to Videocardz, it will have two variants - an 8GB GDDR6X one and a 16GB GDDR6X one. This news has been further validated by Uniko's Hardware which confirmed not only the chip specificaitons but the memory variatns as well. We also now know that the memory will be clocked at 19 Gbps.

The NVIDIA RTX 3070 Ti will be based on the GA104-400 GPU and hafve 6144 CUDA cores divided into 48 GPU clusters. This means it has exactly 2 more clusters than its non-Ti variant and 20 less than the RTX 3080. It will feature 48 RT cores (cor comparison the RTX 3080 has 68) which is also 2 more than the RTX 3070 and 20 less than the RTX 3080. ROPs will be 96 for this segment of NVIDIA's lineup and the clock speed is syet to be confirmed. It will feature a 256-bit memory bus with 8 GB or 16 GB GDDR6X memory clocked at 19 Gbps. It is currently scheduled for release in May 2021 alonside the RTX 3080 Ti but this could change considering the volatile supply situation.