Asus P5K-VM - Manual (Page 82)

2-30 Chapter 2: BIOS setup
The CPU Fan Profile item appears when you enable the CPU Q-Fan Control
feature.
CPU Fan Profile [Optimal]
Allows you to set the appropriate performance level of the CPU Q-Fan. When
set to [Optimal], the CPU fan automatically adjusts depending on the CPU
temperature. Set this item to [Silent Mode] to minimize fan speed for quiet CPU fan
operation, or [Performance Mode] to achieve maximum CPU fan speed.
Configuration options: [Optimal] [Silent Mode] [Performance Mode]
Chassis Fan 1 Speed [xxxxRPM] or [Ignored] / [N/A]
The onboard hardware monitor automatically detects and displays the chassis
fan speed in rotations per minute (RPM). If the fan is not connected to the
motherboard, the field shows N/A.
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.