Intel E3-1220L v3 CM8064601467804 User Manual
Product codes
CM8064601467804
Package C2 State
Package C2 state is an internal processor state that cannot be explicitly requested by
software. A processor enters Package C2 state when:
•
•
All cores and graphics have requested a C3 or deeper power state, but constraints
(LTR, programmed timer events in the near future, and so on) prevent entry to
any state deeper than C 2 state. Or,
•
All cores and graphics are in the C3 or deeper power states, and a memory access
request is received. Upon completion of all outstanding memory requests, the
processor transitions back into a deeper package C-state.
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 state or deeper power state and the processor has
been granted permission by the platform.
•
The platform has not granted a request to a package C6or deeper state but has
allowed a package C6 state.
In package C3 state, the L3 shared cache is valid.
Package C6 State
A processor enters the package C6 low power state when:
•
•
At least one core is in the C6 state.
•
The other cores are in a C6 or deeper power state and the processor has been
granted permission by the platform.
•
If the cores are requesting C7 but the platform is limiting to you a package C6
state, the last level cache in this case can be flushed.
In package C6 state all cores have saved their architectural state and have had their
core voltages reduced to zero volts. It is possible the L3 shared cache is flushed and
turned off in package C6 state. If at least one core is requesting C6 state, the L3
cache will not be flushed.
Package C7 State
The processor enters the package C7 low power state when all cores are in the C7
state . In package C7, the processor will take action to remove power from portions of
the system agent.
Core break events are handled the same way as in package C3 or C6 state.
Note:
C7 state may not be available on all SKUs.
Power Management—Processor
Intel
®
Xeon
®
Processor E3-1200 v3 Product Family
June 2013
Datasheet – Volume 1 of 2
Order No.: 328907-001
57