You can see the games framerate limiter is set to 144, and Special K's is disabled, the present interval is 1 so it's not 1/2 sync. The only thing keeping it at 60 is double buffering, because my gpu is not powerful enough to run it at 120. If I increase the settings, it drops to 40, another multiple. This is the behaviour you are looking for to verify double buffering is active. Explicitly setting 2 buffers does not work in any other games, and I haven't set the buffers in this one either as you can see it is -1. It doesn't work in Left 4 Dead which is a game that should only have double buffering in the first place. The really interesting thing is that if you enable the in-game vsync option, it's still triple buffering, but if you force it on, it's double buffering. Forcing it on in other games just gives triple buffering. Whatever makes it work is unique to Fallen Order. I was only trying Special K here to see if the texture cache could do something about the notorious stuttering the game has.