ASROCK Fatal1ty 990FX Professional Series - North Bridge Confi Guration

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3.4.2 North Bridge Configuration
Primary Graphics Adapter
This item will switch the PCI Bus scanning order while searching for video
card. It allows you to select the type of Primary VGA in case of multiple
video controllers. The default value of this feature is [PCI Express]. Con-
fi guration options: [PCI] and [PCI Express].
IOMMU
Use this to enable or disable IOMMU. The default value of this feature is
[Disabled].