Hey guys been doing a little studying and found gaming benchmarks for the 675m and 675MX and the performance difference is little, and will most likely be the same between the 680m and the 680MX. (Hoping not, but is still adequate)
Links to full gaming lists
http://www.notebookcheck.net/NVIDIA-GeForce-GTX-675MX.82580.0.html
http://www.notebookcheck.net/NVIDIA-GeForce-GTX-675M.70785.0.html
http://www.notebookcheck.net/Computer-Games-on-Laptop-Graphic-Cards.13849.0.html
Here are the pics, the one with the higher fps is the MX
Links to full gaming lists
http://www.notebookcheck.net/NVIDIA-GeForce-GTX-675MX.82580.0.html
http://www.notebookcheck.net/NVIDIA-GeForce-GTX-675M.70785.0.html
http://www.notebookcheck.net/Computer-Games-on-Laptop-Graphic-Cards.13849.0.html
Here are the pics, the one with the higher fps is the MX