Intel BX80633I74960X manual Processor Core Power Management, Direct Media Interface DMI States

Power Management—Processor

Table 15.	Direct Media Interface (DMI) States
	State	Description
	L0	Full on – Active transfer state.
	L0s	First Active Power Management low-power state – Low exit latency.
	L1	Lowest Active Power Management – Longer exit latency.
	L3	Lowest power state (power-off) – Longest exit latency.

Table 16.	G, S, and C Interface State Combinations
	Global	Sleep (S)	Processor	Processor	System Clocks	Description
	(G)	State	Package (C)	State
	State		State
	G0	S0	C0	Full On	On	Full On
	G0	S0	C1/C1E	Auto-Halt	On	Auto-Halt
	G0	S0	C3	Deep Sleep	On	Deep Sleep
	G0	S0	C6/C7	Deep Power-	On	Deep Power-down
				down
	G1	S3	Power off		Off, except RTC	Suspend to RAM
	G1	S4	Power off		Off, except RTC	Suspend to Disk
	G2	S5	Power off		Off, except RTC	Soft Off
	G3	NA	Power off		Power off	Hard off

Table 17.	D, S, and C Interface State Combination
	Graphics	Sleep (S)	Package (C)	Description
	Adapter (D)	State	State
	State
	D0	S0	C0	Full On, Displaying.
	D0	S0	C1/C1E	Auto-Halt, Displaying.
	D0	S0	C3	Deep sleep, Displaying.
	D0	S0	C6/C7	Deep Power-down, Displaying.
	D3	S0	Any	Not displaying.
	D3	S3	N/A	Not displaying, Graphics Core is powered off.
	D3	S4	N/A	Not displaying, suspend to disk.

4.2Processor Core Power Management

While executing code, Enhanced Intel SpeedStep® Technology optimizes the processor’s frequency and core voltage based on workload. Each frequency and voltage operating point is defined by ACPI as a P-state. When the processor is not executing code, it is idle. A low-power idle state is defined by ACPI as a C-state. In general, deeper power C-states have longer entry and exit latencies.

4.2.1Enhanced Intel® SpeedStep® Technology Key Features

The following are the key features of Enhanced Intel SpeedStep Technology:

Desktop 4th Generation Intel® Core™ Processor Family, Desktop Intel® Pentium® Processor Family, and Desktop Intel® Celeron® Processor Family

December 2013	Datasheet – Volume 1 of 2
Order No.: 328897-004	51