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Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families 87
Datasheet Volume One
Power Management
4 Power Management
This chapter provides information on the following power management topics:
•ACPI States
•System States
• Processor Core/Package States
• Integrated Memory Controller (IMC) and System Memory States
• Direct Media Interface Gen 2 (DMI2)/PCI Express* Link States
• Intel QuickPath Interconnect States
4.1 ACPI States Supported
The ACPI states supported by the processor are described in this section.
4.1.1 System States
4.1.2 Processor Package and Core States
Table 4-2 lists the package C-state support as: 1) the shallowest core C-state that
allows entry into the package C-state, 2) the additional factors that will restrict the
state from going any deeper, and 3) the actions taken with respect to the Ring Vcc, PLL
state and LLC.
Table 4-3 lists the processor core C-states support.
Table 4-1. System States
State Description
G0/S0 Full On
G1/S3-Cold Suspend-to-RAM (STR). Context saved to memory
G1/S4 Suspend-to-Disk (STD). All power lost (except wakeup on PCH).
G2/S5 Soft off. All power lost (except wakeup on PCH). Total reboot.
G3 Mechanical off. All power removed from system.
Table 4-2. Package C-State Support (Sheet 1 of 2)
Package C-
State
Core
States
Limiting Factors
Retention and
PLL-Off
LLC Fully
Flushed
Notes
1
PC0 - Active CC0 N/A No No 2
PC2 -
Snoopable Idle
CC3-CC7
• PCIe/PCH and Remote Socket
Snoops
• PCIe/PCH and Remote Socket
Accesses
• Interrupt response time
requirement
• DMI Sidebands
• Configuration Constraints
VccMin
Freq = MinFreq
PLL = ON
No 2