Datasheet

Intel

Xeon

Processor C5500/C3500 Series

February 2010 Datasheet, Volume 1

Order Number: 323103-001 359

Power Management

Note: The package C state resolves to the highest power dissipation C state of the cores.

8.2.5.1 Package C0

This is the normal operating state for the processor. The processor remains in the

normal state when at least one of its cores is in the C0 or C1E state or when the

platform has not granted permission to the processor to go into a low power state.

Individual cores may be in lower power idle states while the package is in C0.

8.2.5.2 Package C1E

The Intel

Xeon

processor C5500/C3500 series supports the package C1E state.

8.2.5.3 Package C3 State

A processor enters the package C3 low power state when:

• At least one core is in the C3 state.

• The other cores are in a C3 or lower power state and the processor has been

granted permission by the platform.

• The platform has not granted a request to a package C6 state but has allowed a

package C6 state.

• All cores may be in C6 but the package may be in package C3, i.e. other socket of

a DP system is in C3.

In the package C3-state, the LLC is snoopable.

Figure 70. Package C-State Entry and Exit

C1E C6

MWAIT