interesting.As I remember it, the g--sync hardware module version starts doubling the frame rate at sub-30fps and even tripling it at extremely low frame rates, so when you dip that low it's still 60fps that it's operating on . While still technically smooth, it will be a slideshow at those rates, what I like to call "frozen" frames compared to higher frame rates. Anyway that's how I remember is unless g-sync changed. Freesync does have a lower limit and some of t..he earlier ones were pretty bad at like 48hz on the low end. There are freesync premium screens that will duplicate frames at lower rates though so that confuses the whole freesync thing.