Where the computer concerned is a desktop once the BIOS detects an add on video card the MBs integrated video port/s will normally be automatically disabled, this can often be manually changed in the BIOS but as long as you have not done so the add on video card will be the primary graphics device and the APU will be disabled, this will free up resources for the processor and result in better overall performance.
Suggested steps for before you intend fitting the new video card;
1: Save the drivers for the new card to a folder created on your desktop.
2: Shut down the computer and disconnect all power cords.
3: Ground yourself on a bare piece of metal on the case or PSU before handling/fitting the new video card.
4: Reassemble the computer ensuring that all connections are correct and secure.
5: Restart the computer in Safe Mode and install the drivers that you saved to your desktop.
6: Restart the computer as you normally would and test.
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