User Manual
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PRIME/PRO/TUF GAMING X570 Series BIOS Manual
1.6.6 PCI Subsystem Settings
The items in this menu allow you to set PCI, PCI-X, and PCI Express settings.
SR-IOV Support
This option enables or disables Single Root IO Virtualization Support if the system has SR-
IOV capable PCIe devices.
Conguration options: [Disabled] [Enabled]
1.6.7 USB Conguration
The items in this menu allow you to set PCI, PCI-X, and PCI Express settings.
The Mass Storage Devices item shows the auto-detected values. If no USB device is
detected, the item shows None.
Legacy USB Support
[Enabled] Your system supports the USB devices in legacy operating systems.
[Disabled] Your USB devices can be used for BIOS setup only and cannot be
recognized in the boot devices list.
[Auto] Your system automatically detects the presence of USB devices at startup.
If any USB devices are detected, the legacy USB support is enabled.
XHCI Hand-off
[Enabled] Enables the support for operating systems without an XHCI hand-off
feature.
[Disabled] Disables the XHCI Hand-off support.
USB Device Enable
This item allows you to enable or disable USB devices.
Conguration options: [Disabled] [Enabled]