NVIDIA was thought to have killed off the 20 GB version of the RTX 3080, but MSI suggests that may not be the case. To date, the board partner has registered the RTX 3080 20 GB under its Suprim, Sea Hawk, Gaming Trio, Aero and Ventus series.
https://www.notebookcheck.net/The-NVIDIA-GeForce-RTX-3080-with-20-GB-of-VRAM-lives-on-as-MSI-registers-eight-SKUs-with-the-EEC.508041.0.html