Which Xbox is 4k?
Photo Credit: Courtesy of 3DStockPhoto (Xbox image)
On Xbox One X, 4K content is displayed in its native 4K resolution, and other content (like games encoded for 1080p) is upscaled to 4K. Games on Xbox One S also get upscaled to 4K. While typically smoother and more detailed than native 720p or 1080p, upscaled 4K is not as rich and detailed as native 4K.