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Intel Desktop Board D845GVFN Product Guide
18
Power Management Features
• 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 board has two power connectors. See Figure 9 on page 34 for the location of the
power connectors.
Fan Headers
The desktop board has one chassis fan header and one processor fan header. See Figure 9 on
page 34 for the location of the fan headers.
Suspend to RAM (Instantly Available PC Technology)
CAUTIONS
For Instantly Available PC technology, the 5 V standby line for the power supply must be capable
of delivering adequate +5 V standby current. Failure to provide adequate standby current when
using this feature can damage the power supply and/or effect ACPI S3 sleep state functionality.
Power supplies used with this desktop board must be able to provide enough standby current to
support the standard Instantly Available (ACPI S3 sleep state) configuration. If the standby
current necessary to support multiple wake events from the PCI and/or USB buses exceeds power
supply capacity, the desktop board may lose register settings stored in memory.
Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-RAM)
sleep state. While in the S3 sleep state, the computer will appear to be off. When signaled by a
wake-up device or event, the system quickly returns to its last known awake state.
If the system has a dual-colored power LED on the front panel, the sleep state is indicated by the
LED turning amber.