I recently bought Lenovo Y50 which comes with Windows 8.1 Update 1 preinstalled.
Apparently it come with hotkeys like volume and brightness. (since some people reported that they haven't include this feature)

I tried to update my Nvidia drivers, but it says that the driver has been modified by Lenovo and can only updated from their site (already checked, their driver is 3 months outdated).

I found the solution how to install official Nvidia driver by using this guide: http://www.youtube.com/watch?v=RKt7HF_-jAk

However some people on YT reported that installing official driver causes  lowers the FPS...

So can someone volunteer to try that driver?
Or should wait Lenovo to update thet driver?

(Drivers checked on both Nvidia Experience & Nvidia website)