Ok firstly do what Bob R. Shake said. Its possible your computer isnt using the graphics card and rather the onboard graphics. Secondly, again do what Bob R Shake said, check for other clients or process running in the background. Now here is my advice:
- If you haven't already make sure to uninstall the pando media booster. This thing can cause some nasty problems and honestly I wouldn't be surprised if that was the cause.
- Go in game and check your FPS limit (it will be in the in game video settings). It might be on a cap or like auto or something.
- Go to
C:\Riot Games\League of Legends\Config
and take a good look in the video config. You might find something odd. I really am not sure what but just take a look.
Hope that helps.
Edit: Also, do you have a synology backup? There is a bug with that and fps so let me know if you do.