vivster on 25 December 2014
This is always a good place to start.
http://www.notebookcheck.net/NVIDIA-GeForce-840M.105681.0.html
Scroll down to the game benchmarks. Looks like it can play current games reasonably well on low resolution 1024x768.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.
