You are probably gaming on your Vega 8 dedicated GPU, you need to game on the Rx560 x Discrete GPU. Also your CPU will not reach max performance unless you follow these steps but remember the CPU will never operate at max unless the game demands it.

Follow the steps below and please click YES if I have answered your question

Make sure you game with your battery charged to 100% BEFORE gaming and KEEP plugged into power while gaming, Windows MUST be set to High Performance plan, then do this:

Open your AMD control center 
First click the Updates tab at the bottom left and make sure your graphics drivers are updated to 19.11.1  or higher and click express upgrade
If you don't have the Adrenaline Control center go here and download it
https://www.amd.com/en/support/kb/release-notes/rn-rad-win-19-11-1



Make sure High Performance is selected under Power Plan in Nitrosense when on AC



After that make sure your games are in listed under switchable graphics and your games are set on High Performance, you must import your games .exe using the Browse tab in pic below



Lastly to run your game on the RX560x you must launch the game from inside the Radeon Adrenalin Control Center. Click the gaming tab then if your game is not there you will need to add your game's .exe by using the ADD button on the right and navigating to your games .exe file, then click the drop down box for your game then click launch. The game will now launch using the RX560x and your CPU should be boosting to MAX but only if needed and it will be monitored in Nitrosense