Asus M2N4-SLI - Manual (Page 93)

4-36 Chapter 4: BIOS setup
12V Voltage[11.96V]
Allows you to set or ignore the 12V voltage.
Configuration options: [11.96V] [Ignore]
CPU Temperature, M/B Temperature
The onboard hardware monitor automatically detects and displays the
motherboard and CPU temperatures. These items are not user-configurable.
CPU FAN Speed, CHASSIS FAN Speed, POWER Fan Speed
The onboard hardware monitor automatically detects and displays the
Chassis, CPU, and power fan speeds in rotations per minute (RPM). If the
fan is not connected to the motherboard, the field shows 0. These items
are not user-configurable.
CPU Fan Speed warning [800 RPM]
Enables or disables the CPU Fan speed warning feature.
Configuration options: [Disabled] [800 RPM] [1200 RPM] [1600 RPM]
Please be careful when the CPU Fan speed warning is set to [Disabled].
It will not produce and warning message during POST even the fan is bad
or not present.