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Desktop Board Features
21
Power Management Features
Power management is implemented at several levels, including:
• Advanced Configuration and Power Interface (ACPI)
• Hardware support:
⎯ Power connectors
⎯ Fan connectors
⎯ Suspend to RAM (Instantly Available PC technology)
⎯ Wake from USB
⎯ Wake from PS/2 keyboard/mouse
⎯ PME# wakeup support
ACPI
ACPI gives the operating system direct control over the power management and Plug and Play
functions of a computer. The use of ACPI with the desktop board requires an operating system that
provides full ACPI support.
Power Connectors
The desktop boards have three power connectors. See Figure 23 on page 46 for the location of the
power connectors.
Fan Connectors
The desktop board has a 4-pin processor fan header and two 3-pin chassis fan headers. See
Figure 22 on page 45 for the location of the fan headers.
Fan Speed Control (Intel
®
Precision Cooling Technology)
Intel Precision Cooling Technology automatically adjusts the processor fan speed based on the
processor thermal diode temperature and adjusts the chassis fan speeds depending on the system
temperature. System fan noise may be reduced by operating controlled chassis and processor fans
at the minimum necessary speeds.
The processor and chassis fan speed control features can be disabled independently through the
desktop board BIOS. Disabling the processor fan speed control will result in the fan operating at
full speed if it is not a self controlled fan. It is recommended that processor fan speed control
remain enabled (default BIOS setting) when using the processor fan heat-sink included with
Intel
®
boxed processors. Disabling the chassis fan speed control results in chassis fans always
operating at full speed. The chassis fan speed control feature should be disabled if a self-controlled
chassis fan is attached to any controlled chassis fan header.
The overall system noise reduction will vary based on system configuration and environment.