I have a Y50 which uses the same processor as that in your screenie.

Mine turbo boosts even when I am doing nothing. To stop it from doing that I need to change the power options in the Lenovo battery tool to medium.

The dumbest thing is that when I play games, it doesn't boost 

yes it's normal. in general your computer will do 2 things when it runs: 1. to interact with you (user); 2. to run background processes (os related, or software-related, eg. checking for windows updates, retrieving latest antivirus patterns). usually if you installed anything (os, software) with their default settings, these software will do their own things in background (especially when the computer is at idle state). all these things are made automated for your convenience as a user. when they run in background, they will use your cpu and ram to do their tasks. so, you will notice that even if you do nothing with your computer, the cpu might be still boosted to handle such tasks.

note that this also means the more software you installed, the more background processes might be introduced to your computer. all these will impact the system resources in your computer (eg. cpu, ram, internet bandwidth) this is why most of the times we will configure the os, and each software, by disabling features that we do not need, so that we can free up things like cpu and ram for our own usage.