Correct Motherboard setting for CPU graphics?

I want to find out which is the correct setting for my motherboard Primary Graphics Adapter.
That setting is part of the chipset configuration.
The choices are

• Onboard
• PCI Express
• PCI

The default setting is PCI Express and that works, but there is no graphics card.
I'm using the Intel HD 4600 graphics with the Core i3 CPU.

Thanks.

 

Hey mjnc...

Man, you know me and you know my mantra: if it ain't broke don't fix it.