There should something very much similiar not being familiar with what bios is on there. But you won't have to worry about any bios settings. When going further through the faq sections at the support site and finding a search box to enter terms the following was found for disabling onboard video on several models including yours.
"How to disable onboard video controller when adding a new video card to the desktop computer.
Solution
The onboard video controller will be automatically disabled when a new video card is detected."
View Document
As suspected and seen on many prebuilds is the automatic detection and disable of the onboard there once you install a separate card. You will still want to go into the device manager however to prevent any drivers from being loaded by simply disablling the onboard item there.