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Chapter 4: AMI BIOS
system cooling. The Performance setting is recommended for high-power-consum-
ing and high-density systems. Select Balanced for the onboard fans to run at 50%
of the Initial PWM Cycle in order to balance the needs between system cooling
and power saving. The Balanced setting is recommended for regular systems with
normal hardware configurations. Select Energy Saving for the onboard fans to run
at 30% of the Initial PWM Cycle for best power efficiency and maximum quietness.
The Options are: Full Speed (@100% of PWM Cycle), Performance (@70% of
PWM Cycle), Balanced (@50% of PWM Cycle), and Energy Saving (@30% of
PWM Cycle).
CPU Vcore, AVCC, 3.3Vcc, 12V, V_DIMM, 5V, -12V, 3.3Vsb, and Vbat
This feature displays the voltage readings for the described components.
ACPI Configuration
Use this feature to configure Advanced Configuration and Power Interface (ACPI)
power management settings for your system.
High Performance Event Timer
Select Enabled to activate the High Performance 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 de-
pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-
tion embedded in the CPU. The High Performance Event Timer is used to replace
the 8254 Programmable Interval Timer. The options are Enabled and Disabled.
USB Device Wakeup from S3/S4
Select Enable to awaken the system via a USB device when the system is in S3
or S4 sleep State. The options are Enabled and Disabled.
ACPI Aware O/S
Enable ACPI support if it is supported by the OS to control ACPI through the Operat-
ing System. Otherwise, disable this feature. The options are Yes and No.
Suspend Mode
This setting allows you to configure the ACPI (Advanced Configuration and Power
Interface) state for your system when it is in the Suspend mode. The options are
S1, S3 and Auto.
AMI OEMB Table
Set this value to allow the ACPI BIOS to add a pointer to an OEMB table in the Root
System Description Table (RSDT) table. The options are Enabled, and Disabled.
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