Asus P3-PE5 - Manual (Page 90)

5-30 Chapter 5: BIOS setup
Start Up Temperature (C) [50]
Fan will srart up when temperature over this value. Sets the value by keying
in a DEC number. Min = 0, Max = 100.
Full Speed Temperature (C) [70]
Fan will become full speed when temperature over this value. Sets the value
by keying in a DEC number. Min = 0, Max = 100.
Start Up PWM [60]
Set PWM value when fan start up. Sets the value by keying in a
DEC number. Min = 0, Max = 127.
Slope PWM [4 PWM/C]
Set PWM increase value when temperature up one degree. Configuration
options: [0 PWM/C] [1 PWM/C] [2 PWM/C] [4 PWM/C] [8 PWM/C]...[64
PWM/C]