It is clearly working without the in-game vsync turned on, you can test for yourself. If I turn off ForceVSync, it's no longer capped at 60fps and will start screen tearing. Thankfully, for gamers with powerful rigs who want to experience the most out of the game, it’s possible to unlock the game to run at more than 60FPS without experiencing screen tear. Using latest NVidia drivers, VSync disabled in the control panel as well. VSync is off, frame limit is uncapped in both game.
I can't get more than 60 FPS in the games I play (League of Legends, Overwatch). So I'm pretty sure this started happening after the Creator's update. Weirdly enough, the mod, which comes from Smudgey5000, was actually designed for the Xbox One. Not just that, but they can also be played at 4k resolution - the downloadable content in question that unlocks this potential is called Uncap FPS.
How to Disable VSync in Fallout 4 - FPS FIX*IMPORTANT* As clarified in the video, cap your FPS with an external tool as letting the game run over a certain t.
