Fine-tuning. Schenker Technologies relies for the M505 on the simple design of the predecessor. The changes underneath the hood are equally marginal. For instance, the IPS panel is accompanied by a GeForce GTX 950M instead of a GeForce GTX 850M. Find out here how this affects the performance.
http://www.notebookcheck.net/Schenker-M505-Clevo-W650SC-Notebook-Review.141395.0.html