Intel BX80646E31230V3, BX80646E31240V3 4.2Processor Core Power Management, 4.2.1Enhanced Intel® SpeedStep® Technology Key Features

									Processor—Power Management
Table 13.	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 14.	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 15.	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:

Intel® Xeon® Processor E3-1200 v3 Product Family
Datasheet – Volume 1 of 2	June 2013
50	Order No.: 328907-001