Intel BX80646E31230V3, BX80646E31240V3 4.4PCI Express* Power Management, 4.5Direct Media Interface (DMI) Power Management, 4.6Graphics Power Management, 4.3.4DDR Electrical Power Gating (EPG)

Power Management—Processor

4.3.4DDR Electrical Power Gating (EPG)

The DDR I/O of the processor supports Electrical Power Gating (DDR-EPG) while the processor is at C3 or deeper power state.

In C3 or deeper power state, the processor internally gates VDDQ for the majority of the logic to reduce idle power while keeping all critical DDR pins such as SM_DRAMRST#, CKE and VREF in the appropriate state.

In C7, the processor internally gates VCCIO_TERM for all non-critical state to reduce idle power.

In S3 or C-state transitions, the DDR does not go through training mode and will restore the previous training information.

4.4PCI Express* Power Management

•Active power management is supported using L0s, and L1 states.

•All inputs and outputs disabled in L2/L3 Ready state.

4.5Direct Media Interface (DMI) Power Management

Active power management is supported using L0s/L1 state.

4.6Graphics Power Management

4.6.1Intel® Rapid Memory Power Management (Intel® RMPM)

Intel Rapid Memory Power Management (Intel RMPM) conditionally places memory into self-refresh when the processor is in package C3 or deeper power state to allow the system to remain in the lower power states longer for memory not reserved for graphics memory. Intel RMPM functionality depends on graphics/display state (relevant only when processor graphics is being used), as well as memory traffic patterns generated by other connected I/O devices.

4.6.2Graphics Render C-State

Render C-state (RC6) is a technique designed to optimize the average power to the graphics render engine during times of idleness. RC6 is entered when the graphics render engine, blitter engine, and the video engine have no workload being currently worked on and no outstanding graphics memory transactions. When the idleness condition is met, the processor graphics will program the graphics render engine internal power rail into a low voltage state.

4.6.3Intel® Graphics Dynamic Frequency

Intel Graphics Dynamic Frequency Technology is the ability of the processor and graphics cores to opportunistically increase frequency and/or voltage above the guaranteed processor and graphics frequency for the given part. Intel Graphics Dynamic Frequency Technology is a performance feature that makes use of unused package power and thermals to increase application performance. The increase in frequency is determined by how much power and thermal budget is available in the

	Intel® Xeon® Processor E3-1200 v3 Product Family
June 2013	Datasheet – Volume 1 of 2
Order No.: 328907-001	61