Nvidia’s pepped-up version of the RTX 3080 graphics card which doubles the RAM on-board to 20GB is indeed inbound, at least going by another nugget of info from the rumor mill – in this case, direct from a GPU manufacturer.

Videocardz highlighted a slide from a presentation delivered by Galax (GPUs which are branded KFA2 in Europe) which clearly shows the existence of a 20GB version of the RTX 3080 (alongside the launch variant which has 10GB).
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https://www.techradar.com/news/nvidia-rtx-3080-20gb-and-rtx-3060-leak-suggests-an-imminent-attack-on-amds-big-navi-and-midrange-gpus