Chapter 4: AMI BIOS
4-19
Celsius and Fahrenheit) as it is detected by the BIOS.
Fan 1 ~ Fan 8 Reading
This feature displays the fan speed readings from fan interfaces Fan 1 through
Fan 8.
Fan Speed Control Modes
This feature allows the user to decide how the system controls the speeds of the
onboard fans. The CPU temperature and the fan speed are correlative. When the
CPU on-die temperature increases, the fan speed will also increase for effective
system cooling. Select "Full Speed/FS" to allow the onboard fans to run at full
speed for maximum cooling. The FS setting is recommended for special system
confi guration or debugging. Select "Performance/PF" for better system cooling. The
PF setting is recommended for high-power-consuming and high-density systems.
Select "Balanced/BL" for the onboard fans to run at a speed that will balance the
needs between system cooling and power saving. The BL setting is recommended
for regular systems with normal hardware confi gurations. Select "Energy Saving/ES"
for best power effi ciency and maximum quietness. The Options are: Full Speed/FS,
Performance/PF, Balanced/BL, and Energy Saving/ES.
Voltage Monitoring
CPU1 Vcore, CPU2 Vcore, CPU1 DIMM, CPU2 DIMM, 5V, 5VSB, 12V, -12V, 3.3Vcc,
3.3VSB, VBAT and Vtt.
ACPI Confi guration
Use this feature to confi gure Advanced Confi guration and Power Interface (ACPI)
power management settings for your system.
High Precision Event Timer
Select Enabled to activate the High Precision Event Timer (HPET) that produces
periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does
in synchronizing multimedia streams, providing smooth playback and reducing
the dependency on other timestamp calculation devices, such as an x86 RDTSC
Instruction embedded in the CPU. The High Performance Event Timer is used
to replace the 8254 Programmable Interval Timer. The options are Enabled and
Disabled.
ACPI Aware O/S
Select Yes to enable ACPI support for an operating system that supports ACPI.
Select No to disable ACPI support for an OS that does not support ACPI. The op-
tions are Yes and No.
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