I tried 0 A.D. with different configurations these are the results:
1. 1080p@120Hz vsync on: The game produces FPS between 160-38 FPS. Gameplay is stuttering as a result.
2. 1080p@120Hz vsync off/framelimiter at 60FPS on: The game produced FPS between 68-54 FPS. Gameplay feels dragging and there is ghosting visible. This might be caused by the fact that the game is running at half of the framerate my screen is set to.
3. 1080p@60Hz vsync on: The game runs smoooth and without stutter. So i have to reduce the refreshrate of my screen each time before starting the game to get a good experience.