North Bridge Configuration - ASROCK 970 Extreme3 R2.0 User Manual

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-
figuration options: [PCI] and [PCI Express].
IOMMU
Use this to enable or disable IOMMU. The default value of this feature is
[Disabled].
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