Asus X99-A/USB 3.1, Manual

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Chapter 3: BIOS setup
Chapter 3
EXT Fan 1/3 Middle Temperature [45]
Use the <+> or <-> keys to set the value for EXT Fan Middle Temperature.
EXT Fan 1/3 Middle Duty Cycle(%) [60]
Use the <+> or <-> keys to adjust the extension fan middle duty cycle. The
values may differ via Qfan tuning.
EXT Fan 1/3 Lower Temperature [40]
Use the <+> or <-> keys to adjust the extension fans’ lower temperature.
The values may differ via Qfan tuning.
EXT Fan 1/3 Min. Duty Cycle (%) [60]
Use the <+> or <-> keys to adjust the extension fans’ duty cycle when the
temperature of the extension fans is 40 degrees or below. The values may
differ via Qfan tuning.
Allow Fan Stop [Disabled]
This item allows the extension fans to run at 0% duty cycle when the
temperature of the source drops below the lower temperature.
Configuration options: [Disabled] [Enabled]
Anti Surge Support [ON]
This item allows you to turn on/off the OVP (Over Voltage Protection) and UVP (Under
Voltage Protection) functions. This causes the system to automatically shut down when the
voltage exceeds the safe range that protects the motherboard’s components.
Configuration options: [ON] [OFF]
Chassis Intrude Detect Support [ON]
This item allows you to turn on/off the chassis intrude detect feature.
Configuration options: [ON] [OFF]