Intel E5-2470 BX80621E52470 User Manual

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families

71

Datasheet Volume One

The client address may not be changed after PWRGOOD assertion, until the next power 

cycle on the processor. Removal of a processor from its socket or tri-stating a processor 
will have no impact to the remaining non-tri-stated PECI client addresses. Since each 

socket in the system should have a unique PECI address, the SOCKET_ID strapping is 

required to be unique for each socket.

The processor PECI client may be fully functional in most core and package C-states.

• The Ping(), GetDIB(), GetTemp(), RdPkgConfig() and WrPkgConfig() commands 

have no measurable impact on CPU power in any of the core or package C-states.

• The RdIAMSR() command will complete normally unless the targeted core is in a C-

state that is C3 or deeper. The PECI client will respond with a completion code of 

0x82 (see 

 for definition) for RdIAMSR() accesses in core C-states that 

are C3 or deeper. 

• The RdPCIConfigLocal(), WrPCIConfigLocal(), and RdPCIConfig() commands will 

not impact the core C-states but may have a measurable impact on the package C-
state. The PECI client will successfully return data without impacting package C-

state if the resources needed to service the command are not in a low power state.

— If the resources required to service the command are in a low power state, the 

PECI client will respond with a completion code of 0x82 (see 

 for 

definition). If this is the case, setting the “Wake on PECI” mode bit as described 

in 

can cause a package ‘pop-up’ to the C2 state and enable 

successful completion of the command. The exact power impact of a pop-up to 

C2 will vary by product SKU, the C-state from which the pop-up is initiated and 

the negotiated PECI bit rate.

Ground

Ground

0x30

Ground

V

TT

0x31

V

TT

Ground

0x32

V

TT

V

TT

0x33

Ping()

Not measurable

GetDIB()

Not measurable

GetTemp()

Not measurable

RdPkgConfig()

Not measurable

WrPkgConfig()

Not measurable

RdIAMSR()

Not measurable. PECI client will not return valid data in core C-state that is C3 or deeper

RdPCIConfigLocal()

May require package ‘pop-up’ to C2 state

WrPCIConfigLocal()

May require package ‘pop-up’ to C2 state

RdPCIConfig()

May require package ‘pop-up’ to C2 state