https://wccftech.com/nvidia-geforce-rtx-3080-20-gb-currently-planned-for-launch-in-december/

According to Videocardz's sources, NVIDIA is now planning to launch the RTX 3080 20 GB variant sometime in December. We had first heard about the 20GB variant before the Ampere series was announced and it had originally been planned for release just after AMD's Big Navi. This new timeline would represent a delay of about a month or so - assuming AMD goes with a hard launch of their Big Navi series and NVIDIA would not have made such a decision lightly.

The NVIDIA RTX 3080 would be based on the PG132 SKU20 and has been in the pipeline for quite some time. While it features the same CUDA Cores (as per leaks) it has twice the amount of memory. Considering the fact that killer apps like Microsoft Flight Simulator 2020 already chomp away all the vRAM the 2080 Ti had to offer, 10 GB is going to feel tiny after a year or two. Considering next-gen consoles are already driving games with asset-streaming of large worlds, vRAM is going to start becoming a lot more crucial than before. With AMD launching a card with 16GB of vRAM, NVIDIA had to reply with their own high vRAM card.