ASRock 970 Extreme4 User Manual - Page 56

North Bridge Configuration - iommu

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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]. Conf guration options: [PCI] and [PCI Express]. IOMMU Use this to enable or disable IOMMU. The default value of this feature is [Disabled]. 56

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