1000 Hz is going to be the end. Microsoft’s experiments, umpteen years ago, said that’s about the limit of human perception. Not “it looks smooth,” but “it looks indistinguishable from reality because our wetware can’t discern events much finer than that.” Mmmaybe you go a little above that, to avoid two-millisecond events, but beyond that there is literally no point. Shutterglasses, I guess. Niche silliness.

More importantly - any framerate looks amazing. Same deal as G-Sync / FreeSync: frames appear onscreen the moment they are ready. There’s no stutter at 29 Hz, or at 239 Hz.