Users will get a 60 to 90 percent boost in graphics performance between the two models, but there's a huge catch. If you don't need the GPU power, then the physically identical and steadier older model will be more than enough.
https://www.notebookcheck.net/The-Dell-XPS-13-9310-2-in-1-is-both-a-minor-and-major-upgrade-over-the-older-XPS-13-7390-2-in-1.568810.0.html
Why was the Witcher test for one model run on low graphics and the other on medium. With different resolutions for what the article says is the exact same screen?