This likely depends on the game, as BF1 and BF5, although limited to 200 FPS, cannot currently achieve it with a 2080Ti, but, yet FPS goes up when details/quality are turned down or resolution lowered...(implying still GPU limited)
We should know as soon as the reviews are out!
(Although if you are already getting 200 fps in game 'XYZ' with a 2070 at 1080P, jumping to 340 fps might not seem all that beneficial...if even noticeable...)