Asus MAXIMUS IV EXTREME-Z User Manual page 116

Legacy USB3.0 Support [Enabled]
[Enabled]
[Disabled]
EHCI Hand-off [Disabled]
[Enabled]
[Disabled]
USB 2.0 Switch [PCH]
Allows you to select from PCH to NEC for USB 2.0 ports.
Configuration options: [PCH] [NEC]
3-24
Enables the support for USB 3.0 devices on legacy operating
systems (OS).
Disables the function.
Enables the support for operating systems without an EHCI
hand-off feature.
Disables the function.
Chapter 3: BIOS setup