A source has published a complete performance comparison of Xbox One X vs Xbox One and the results are very clear and interesting, although it has been limited to 4K adaptations of existing or developing games.
As you can see in the pictures we do not have the specific names of each game, but a description of each and the settings used in Xbox One. This allows us to have a clearer idea of what we can expect from Xbox One X and how it positions in front of the current Microsoft console.
First of all we must take into account that the tests have been carried out with “rudimentary” 4K adaptations of the own Microsoft, which means that they do not include all the possible optimizations and that with some additional work superior results could be obtained.
Xbox One X vs Xbox One: Comparison
There is a lot of information to assimilate so let’s summarize the important thing. In general the improvement achieved by Xbox One X against Xbox One is quite large and is even noticeable in “poor” adaptations, but we have been able to appreciate that it depends a lot on the resolution of each game in the original Microsoft console.
So if a game runs on 720p on Xbox One it is very difficult for it to reach the 2160p (4K) natively while maintaining the same frame rate per second.
One of the clearest examples we have in game H (Star Wars Battlefront), which works at 1,280 x 720 pixels and 60 FPS on Xbox One, while the port to Xbox One X reaches 2160p but with averages below 40 FPS.
We can understand it perfectly since the jump from 720p to 2160p is much higher than that from 1080p to 2160p. This means it takes more effort on the console hardware, and highlights that Xbox One X will not be able to move everything in native 4K.