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H77MU3 UEFI BIOS Manual

PCIe Speed

This item s elects PCI Express port speed.

Options: Auto (Default) / Gen1 / Gen2

USB Configuration

XHCI Pre-Boot Driver

This item enables or disables XHCI Pre-Boot Driver s upport.

Options: Enabled (Default) / Disabled

XHCI Mode

This item sets the mode of operation of XHCI controller.

Options: Smart Auto (Default) / Auto / Enabled / Disabled

HS Port #1 / #2 / #3 / #4 Switchable

This item allows for HS port switching between xHCI and ECHI/ If disabled, port is

routed to ECHI, If Hs port is routed to XHCIU, the corresponding SS port is enabled.

Options: Enabled (Default) / Disabled

xHCI Streams

This item enables xHCI maximum primary stream array size.

Options: Enabled (Default) / Disabled

EHCI1/2

This item controls the USB EHCI (USB2.0) functions. One EHCI controller must

always be enabled.

Options: Enabled (Default) / Disabled

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