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RTX 3080 action: https://www.youtube.com/watch?v=8TrejINwaVo
A few oddities in this video; awful recording fps, DDR4 VRAM??, only using 16Gb system RAM (could be the reason it recorded so choppy).
Anyhow, the 3080 will certainly gain you some benefits compared to older cards but no where near as much as standard games. Then again, MSFS 2020 is a sim, not a game, but easily the best looking sim & game at the same time.