Asus STRIX X99, Manual

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Chapter 3: BIOS Setup
Chapter 3
HD Audio Controller [Enabled]
This item allows you to use the Azalia High Definition Audio Controller.
Configuration options: [Disabled] [Enabled]
PCIEX4_1 Slot Bandwidth [Auto]
[Auto] Runs at AUTO mode with USB3.1_EC1, USB3.1_EA2 enabled and
PCIEX1_2 slot enabled.
[X1 Mode] Runs at x1 mode with USB3.1_EC1_EA2 port and PCIEX1_2 slot enabled.
[X4 Mode] Runs at x4 mode for a high performance support with USB3.1_EC1_EA2
ports and PCIEX1_2 slot disabled.
PCIEX8_3 Slot Bandwidth [Auto]
[Auto] When a PCIe device higher than x4 interface is installed on the PCIEX8_3
slot, PCIEX16/X8_1 and PCIEX8_3 slots will automatically run at x8 mode.
[X8 Mode] PCIEX16/X8_1 and PCIEX8_3 slots run at x8 mode. Supports x1/x2/x4/x8
devices.
M2/U2 Switch [Auto]
[Auto] The bandwidth will be switched to U.2 by default. When a M.2 device is
detected, the bandwidth will automatically be switched to M.2.
[M.2 Mode] The bandwidth will be switched to M.2 with U.2 disabled.
[U.2 Mode] The bandwidth will be switched to U.2 with M.2 disabled.
Asmedia USB 3.1 Controller [Enabled]
This item allows you to enable or disable the Asmedia USB 3.1 controller of your system.
Configuration options: [Disabled] [Enabled]
Asmedia USB 3.1 Battery Charging Support [Disabled]
This item allows you to enable or disable the Asmedia USB 3.1 Battery Charging support of
your system.
Configuration options: [Disabled] [Enabled]
RGB LED(onboard) [Enabled]
[Disabled] LEDs will not light up.
[Enabled] LEDs will always light up at the S0(Working), S3(Sleep), and S5(Soft off)
states, but not at the S5 state when the ErP Ready is enabled.