If the game does not have a stable performance with the AMD/Nvidia video card, it is possible that it uses your integrated GPU (graphics processing unit).
Most laptops (and sometimes desktop PCs) have more than one graphics processor: integrated and dedicated.
If the game uses your integrated graphics processor instead of a dedicated video card, you might notice certain performance issues. The solution in such situation would be to set a preferred graphics processor.
How to choose a dedicated Nvidia video card:
- Open Nvidia Control Panel application. You can do this by clicking the right mouse button on your desktop, and selecting Nvidia Control Panel in the drop down menu.
- Proceed to 3D Settings > Manage 3D settings.
- Click on Program Settings tab and select the game in the drop down list.
- Now select the preferred graphics processor in the drop down list. If you want to use the dedicated video card, select High-performance Nvidia processor.
Apply the selected settings. Now the game should use your Nvidia video card.
How to choose a dedicated AMD video card:
- Open the Radeon Settings application. You can do this by clicking the right mouse button on your desktop, and selecting Radeon Settings in the drop down menu.
- Proceed to Preferences > Additional Setting > Power > Switchable graphics Application Settings
- Select the game from the applications list. If the game is not in the list, click Browse and select the .exe file from the game's installation folder, then click Add Application. This will allow you to add the game to the applications list.
- Once the game is selected, click High Perfomance.
Apply the selected settings. Now the game should use your AMD video card.