Asus P5N-D - Manual (Page 100)

4-34 Chapter 4: BIOS setup
Vcore Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage
The onboard hardware monitor automatically detects the voltage output through
the onboard voltage regulators. Select [Ignored] if you do not want to detect this
item.
CPU Temperature [xxxºC/xxxºF]
M/B Temperature [xxxºC/xxxºF]
The onboard hardware monitor automatically detects and displays the motherboard
and CPU temperatures. Select [Ignored] if you do not wish to display the detected
temperatures.
CPU Fan Speed [xxxxRPM]
CHA_FAN 1/2 Speed [xxxxRPM]
PWR_FAN Speed [xxxxRPM]
The onboard hardware monitor automatically detects and displays the CPU/
Chassis/Power fan speed in rotations per minute (RPM). If the fan is not connected
to the motherboard, the field shows 0 RPM.
CPU Fan Speed warning [600 RPM]
Allows you to set the CPU fan warning speed function, which gives off a warning
when the CPU fan speed is too low. If you set this item to [Disabled], the system
will not warn you even if no fan is installed or if the fan is not functioning properly.
Configuration options: [Disabled] [600 RPM] [1200 RPM] [1600 RPM]