GPU downgrade. Dell's 17.3-inch all-rounder comes with a Skylake processor and matte Full HD screen. A Radeon graphics card is also on board. However, Dell opted for a rather weak model that does not quite fit to the concept of an 800 Euro all-rounder.
http://www.notebookcheck.net/Dell-Inspiron-17-5759-5118-Notebook-Review.157182.0.html