Define "fine." I just tried the game in 3440x1440 on a 1070Ti (paired with a 3800X), and in the starting cave got 40FPS at Ultra, 60-70FPS at Low. This seems consistent with the benches in this review where at 16:9 2560x1440 the 1080FE (1070Ti OC equivalent) gets around 50FPS on Ultra. Extrapolating that 50FPS to 21:9 logically yields around 40FPS.
Fwiw, in-game bench showed: min 34, max 95 for Low; and min 24, max 63 for Ultra. Wish the 3080s would come back in stock
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