http://wccftech.com/original-xbox-games-pixels-xbox-one-x/

Original Xbox games will take advantage of the extra power of both the Xbox One and upcoming Xbox One X with up to 16X the pixel count.

Microsoft will be releasing 13 original Xbox games today as part of its backwards compatibility program for the Xbox One family, including Ninja Gaiden Black, Star Wars: Knights of the Old Republic, Black, and Crimson Skies: High Road to Revenge.