During its E3 2017 press conference, Microsoft officially unveiled Xbox One X, a high-end version of Xbox One which will be released on November 7, 2017. First teased at E3 2016 under the codename "Project Scorpio",

Xbox One X features upgraded hardware that is designed primarily to play games at 4K resolution, and super sampling to provide graphical improvements on high-definition displays.

Xbox One X will also provide performance gains for existing Xbox One titles; for example, Halo 5: Guardians, which uses a scaling system that dynamically lowers the game's resolution when needed to maintain a consistent frame rate, was able to run at its native resolution with no scaling on Xbox One X.

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Source: Wikipedia

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