https://wccftech.com/nvidia-hints-at-rtx-3080-graphics-card-with-20gb-memory/

Videocardz has found an indirect confirmation of our exclusive almost a month back from none other than NVIDIA themselves. The company published a white paper in which every card mentioned was written without any specific memory details but the RTX 3080 was written specifically with the 10GB suffix - indicating there are more variants planned and they wanted the whitepaper to be futureproofed for any discrepancies or confusion with the 20GB variant.

The RTX 3080 10GB is an amazing card but it has one major caveat: it only has 10GB of vRAM. With titles like MSFS 2020 already out and requiring at least 16GB of vRAM to run comfortably, the low amount of memory on the 3080 will bottleneck it in future titles. This is why, even without any confirmation, we were sure that the company would release a 20 GB variant as well. This seems to have been more or less indirectly confirmed by NVIDIA in their recently released Ampere whitepaper.