The list of Xbox games that support Microsoft’s new framerate-doubling feature, FPS boost, is steadily increasing. Today marks the addition of 74 new titles, which include fan favorites such as Alien Isolation (up to 60 Hz), Gears of War 4 (up to 60 Hz), Halo Wars 2 (up to 60 Hz) and Metro 2033 Redux (up to 120 Hz). Xbox Series X and Xbox Series S owners can check whether their games are running in FPS Boost mode (and if Auto HDR mode is enabled) by simply tapping on the Xbox Button and checking the Guide overlay indicator in the upper right corner.
In some instances, because there are higher graphics requirements to enable FPS Boost technology, we’ve had to reduce a game’s resolution to ensure it both runs smoothly and plays great. In those select cases, FPS Boost is not automatically enabled for Xbox Series X gamers, but can easily be turned on under the Compatibility Options in the Manage game and add-ons setting.
Source: Xbox