Vol 1

Intel® Xeon® Product 2800/4800/8800 v2 Product Family 31
Datasheet Volume One, February 2014
Power Management
3 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
3.1 ACPI States Supported
The ACPI states supported by the processor are described in this section.
3.1.1 System States
3.1.2 Processor Package and Core States
Table 3-2 lists the package C-state support as:
• The shallowest core C-state that allows entry into the package C-state
• The additional factors that will restrict the state from going any deeper
• The actions taken with respect to the Core, PLL and LLC
Table 3-1. System States
State Description
G0/S0 Full On
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 3-2. 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-CC6 • 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