kevindd992002 wrote:So are you saying that anything below 1000fps is not worth not using GSYNC?
Not necessarily. The threshold of "not worth it" depends. And it is also a personal preference too.
That said, 1000fps+ is so far beyond the max Hz of current VRR monitors, and lag-reduction so consistent, that it's reliably lower lag than GSYNC (until 1000Hz GSYNC monitors arrive).
The scanout lag affects lag measurement methodology ("lag to first screen reaction anywhere" versus "lag for center of screen") and will affect this greatly. The min/max/average will behave differently for different lag measurement methodologies.
For screen centre (measuring lag only at crosshairs), the mathematical crossover point where VSYNC OFF starts to consistently have lower average input lag than a well-optimized GSYNC system -- is roughly twice the framerate of refresh rate. But if you're measuring to first screen reaction anywhere, the math suddenly changes. This is relevant for close-quarters combat, peripheral vision, screen flashes, explosions, etc -- where you can react to frameslices (VSYNC OFF) delivered sooner in previous refresh cycle. If most of what you do is only visible in screen centre, lag measurement methodology can change all over again (due to scanout lag factor). Framerates not much above GSYNC max rate doesn't always consistently favour VSYNC OFF, but ultra-high framerates clearly show lag advantage.
Although for this specific lag test run, we've been measuring "to first screen reaction, anywhere", the Average bar (lime green color) will roughly (mathematically) generally correspond to screen-centre lag (crosshairs) -- the lag measurement methodology does not map 1:1 -- but it illustrates the lag-reducing benefits of frame rates far exceeding monitor's refresh rate -- with diminishing returns.
Very clearly, the worst-case "VSYNC OFF" lag consistently keeps going down, the higher the framerate you go (even when you've already maxed-out the best case lag). You notice when you reach quadruple-digit frame rates, the worst-case VSYNC OFF lag (dark grey bar) start to beat a lot of "average lag" GSYNC numbers (lime green bar) of properly-configured low-lag GSYNC.