User Manual
40
PRIME X399-A BIOS Manual
CPU Middle Temperature
Use the <+> and <-> keys to adjust the CPU middle temperature.
CPU Fan Middle Duty Cycle(%)
Use the <+> or <-> keys to adjust the CPU fan middle duty cycle.
CPU Lower Temperature
Use the <+> or <-> keys to adjust the lower limit of the CPU temperature.
The CPU fan will operate at the minimum duty cycle when the CPU
temperature is lower than the limit.
CPU Fan Min. Duty Cycle(%)
Use the <+> and <-> keys to adjust the minimum CPU fan duty cycle.
When the CPU temperature is lower than the lower limit, the CPU fan will
operate at the minimum duty cycle.
Chassis Fan(s) Configuration
Chassis Fan 1-2 Q-Fan Control
This item allows you to set the chassis fan operating mode.
[Auto] Detects the type of chassis fan installed and automatically switches
the control modes.
[PWM Mode] Enables the Chassis Fan Q-Fan Control feature in PWM mode for
4-pin chassis fan.
[DC Mode] Enables the Chassis Fan Q-Fan Control feature in DC mode for
3-pin chassis fan.
[Disabled] Disables the Q-Fan control.
Chassis Fan 1-3 Q-Fan Source
The assigned fan will be controlled according to the selected temperature source.
Conguration options: [CPU] [MotherBoard] [VRM] [PCH] [T_Sensor] [EXT_Sensor1]
[EXT_Sensor2] [EXT_Sensor3] [Multiple Sources]
• For EXT_Sensor1-3, connect a Thermistor cable to one of these connectors, then
tape the other end on a critical component to control its temperature.
• For Multiple Sources, select up to three temperature sources and the fan will
automatically change based on the highest temperature.
Chassis Fan 1-3 Smoothing Up/Down Time
This item allows you to set the Chassis Fan Smoothing Up/Down Time. Conguration
options: [0 sec] [2.6 sec] [3.8 sec] [5.1 sec] [6.4 sec] [7.7 sec] [15.9 sec] [31.9 sec]
[63.8 sec] [255 sec]
Chassis Fan 1-3 Fan Speed Low Limit
This item allows you to disable or set the chassis fan warning speed.
Conguration options: [Ignore] [200 RPM] [300 RPM] [400 RPM] [500 RPM] [600 RPM]