Intel D845EPI User Manual

Product Description
31
For information about Refer to
The Desktop Boards’ compliance level with ACPI Section 1.5, page 17
1.13.1.1 System States and Power States
Under ACPI, the operating system directs all system and device power state transitions. The
operating system puts devices in and out of low-power states based on user preferences and
knowledge of how devices are being used by applications. Devices that are not being used can be
turned off. The operating system uses information from applications and user settings to put the
system as a whole into a low-power state.
Table 8 lists the power states supported by the Desktop Board D845EPI along with the associated
system power targets. See the ACPI specification for a complete description of the various system
and power states.
Table 8. Power States and Targeted System Power
Global States Sleeping States
Processor
States Device States
Targeted System
Power
(Note 1)
G0 – working
state
S0 – working C0 – working D0 – working
state.
Full power > 30 W
G1 – sleeping
state
S1 – Processor
stopped
C1 – stop
grant
D1, D2, D3 –
device
specification
specific.
5 W < power < 52.5 W
G1 – sleeping
state
S3 – Suspend to
RAM. Context
saved to RAM.
No power D3 – no power
except for
wake-up logic.
Power < 5 W
(Note 2)
G1 – sleeping
state
S4 – Suspend to
disk. Context
saved to disk.
No power D3 – no power
except for
wake-up logic.
Power < 5 W
(Note 2)
G2/S5 S5 – Soft off.
Context not saved.
Cold boot is
required.
No power D3 – no power
except for
wake-up logic.
Power < 5 W
(Note 2)
G3 –
mechanical off
AC power is
disconnected
from the
computer.
No power to the
system.
No power D3 – no power for
wake-up logic,
except when
provided by
battery or external
source.
No power to the system.
Service can be performed
safely.
Notes:
1. Total system power is dependent on the system configuration, including add-in boards and peripherals powered
by the system chassis’ power supply.
2. Dependent on the standby power consumption of wake-up devices used in the system.

Intel D845EPI Specifications

General

Brand	Intel
Model	D845EPI
Category	Motherboard
Language	English