6 hardware monitor, Power on by ring [disabled, Power on by rtc alarm [disabled – Asus Crosshair IV Formula User Manual
Page 108: Voltage monitor, Temperature monitor

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Chapter 3: BIOS setup
Power On By Ring [Disabled]
[Disabled]
Disables to power up the computer when the external modem
receives a call while the computer is in Soft-off mode.
[Enabled]
The computer could be powered up when the external modem
receives a call while the computer is in Soft-off mode.
The computer cannot receive or transmit data until the computer and
applications are fully running. Thus, connection cannot be made on the first
try. Turning an external modem off and then back on while the computer is off
causes an initialization string that turns the system power on.
Power On By RTC Alarm [Disabled]
[Disabled]
Disables RTC to generate a wake event.
[Enabled]
When set to [Enabled], the items RTC Alarm Date (Days) and
RTC Alarm Time (HH:MM:SS) will become user-configurable with
set values.
3.6.6
Hardware Monitor
Crosshair IV Formula BIOS Setup
Advanced
Hardware Monitor
Voltage Monitor
Temperature Monitor
Fan Speed Monitor
Fan Speed Control
Voltage Monitor
Voltage Monitor
CPU Voltage; CPU/NB Voltage; CPU VDDA Voltage; DRAM Voltage;
HT Voltage; NB Voltage; SB Voltage; 3.3V Voltage; 5V Voltage; 12V Voltage
The onboard hardware monitor automatically detects the voltage output
through the onboard voltage regulators.
Temperature Monitor
CPU Temperature; MB Temperature; NB Temperature; SB Temperature;
OPT TEMP 1/2/3 Temperature [xxxºC/xxxºF]
The onboard hardware monitor automatically detects and displays the
CPU, motherboard, northbridge, southbridge, and the assigned devices
temperatures. Select [Ignored] if you do not wish to display the detected
temperatures.
MB overheat Protection [90ºC]
SB overheat Protection; NB overheat protection [100ºC]
The system automatically shuts down when the motherboard, northbridge
or southbridge chipset is heated over the set temperature to protect it from
damage. Configuration options: [Disabled] [70ºC] [80ºC] [90ºC] [100ºC]