Asus P5SD1-FM2 User Manual page 70

Fan Auto Mode Start Voltage [2.0V]
Allows you to select the voltage level at which the fan automatically starts.
Configuration options: [2.0V] [3.0V] [4.0V]
Fan Auto Mode Start Speed Temp [45ºC]
Allows you to select the temperature level at which the fan automatically
starts. Configuration options: [10ºC] ~ [75ºC]
Fan Auto Mode Full Speed Temp [70ºC]
Allows you to select the temperature level at which the fan automatically
runs at full speed. Configuration options: [25ºC] ~ [75ºC]
Fan Auto Mode Slope PWM [2 PWM value/ºC]
Configuration options: [0 PWM value/ºC] [1 PWM value/ºC]
[2 PWM value/ºC] [4 PWM value/ºC] [8 PWM value/ºC] [16 PWM value/ºC]
[32 PWM value/ºC] [64 PWM value/ºC]
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This Manual: http://www.manuallib.com/file/2595652
The above items appear only when the Smart Q-Fan Function item
is set to [Enabled].
Chapter 2: BIOS setup