The Xbox One uses custom-designed chips from Advanced Micro Devices Inc. It cannot play games for the Xbox 360, but Xbox One owners probably will want only state-of-the-art titles anyway. After initially threatening a digital-rights scheme that would have blocked games previously played on other Xbox Ones, Microsoft reversed course and now says you'll be able to buy, sell and trade used games as much as you want.
Microsoft promises eight times the graphical performance of the Xbox 360. The images in the games I tried are on par with the PS4's — as detailed and realistic as anything yet produced by a living-room console.