Intel D945GCLF2 System States and Power States, Power States and Targeted System Power

Intel Desktop Board D945GCLF2 Technical Product Specification

1.13.1.1System 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 7 lists the power states supported by the board along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states.

Table 7. Power States and Targeted System Power

Global			Processor		Targeted System
States	Sleeping States		States	Device States	Power (Note 1)
G0 – working	S0	– working	C0 – working	D0 – working	Full power > 30 W
state				state.
G1 – sleeping	S1	– Processor	C1 – stop	D1, D2, D3 –	5 W < power < 52.5 W
state	stopped		grant	device
				specification
				specific.
G1 – sleeping	S3	– Suspend to	No power	D3 – no power	Power < 5 W	(Note 2)
state	RAM. Context			except for
	saved to RAM.			wake-up logic.
G1 – sleeping	S4	– Suspend to	No power	D3 – no power	Power < 5 W	(Note 2)
state	disk. Context			except for
	saved to disk.			wake-up logic.
G2/S5	S5	– Soft off.	No power	D3 – no power	Power < 5 W	(Note 2)
	Context not saved.			except for
	Cold boot is			wake-up logic.
	required.
G3 –	No power to the		No power	D3 – no power for	No power to the system.
mechanical off.	system.			wake-up logic,	Service can be performed
AC power is				except when	safely.
disconnected				provided by
from the				battery or
computer.				external source.

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.

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