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Many games have frame pacing issues, JRPG PC ports are notorious for this as an example.
Tales of vesperia as an example has a stutter issue that only kicks in, in the following scenario, 60hz, no adaptive sync. Using either 120hz (even with 60fps cap) or adaptive sync fixes it.
I am using it on fable anniversary at 1440p, the game uses barely any gpu utilisation at all but is 59-61fps instead of flat 60 and stutters without gsync.
The only games I observe that seem really well optimised tend to be multiplayer shooters. Probably because they typically natively developed on PC and smooth performance is a requirement for the gameplay.
That's fair point. I really only play FPS games so have never really experienced 'tearing'.