1080TI can take heavy hits at 2560x1080 even, Battlefield 1 max settings can see 90 FPS at times. 2560x1080 @ 200hz it can't even come close to consistently with high-end games and settings. PUBG? frames are meh. Even with an overclocked card it can be rough sometimes in my experience.

Personally i'll be upgrading to the next card that trumps the 1080 ti and moving from 2560x1080 200hz (for all but CS, cs is 1280x960 @ 144 on another monitor) and going back to 1080p @ 250hz.

ultrawide is god-tier for movies and productivity work, though.