Features
7.2
Clock Control and Low Power States
The processor supports low power states at the individual thread, core, and package
level for optimal power management.
7.2.1
Processor C-State Power Specifications
Table 7-1 lists C-State power specifications for various Intel Xeon Processor E7-8800/
4800/2800 Product Families processor SKUs.
Table 7-1.
Processor C-State Power Specifications
Intel Xeon Processor
E7-8800/4800/2800
Product Families
Intel Xeon Processor
E7-8800/4800/2800
Product Families
Intel Xeon Processor
E7-8800/4800/2800
Product Families
Package
C-State
1
processor 130W
processor 105W
processor 95W
C1E
C3
56
36
31
54
35
29
54
35
29
C6
Notes:
1. Values are with all cores in the specified C-State.
7.3
Sideband Access to Processor Information ROM
via SMBus
7.3.1
Processor Information ROM
Offset/
Section
# of
Bits
Function
Notes
Examples
Header
00h
8
Data Format Revision
PIROM Size
Two 4-bit hex digits
Start with 00h
01-02h
16
Size in bytes (MSB first)
Use a decimal to hex transfer; 128
bytes = 0080h:
03h
8
8
Processor Data Address
Processor Core Data Address
Processor Uncore Data Address
Package Data Address
Part Number Data Address
Thermal Reference Data Address
Feature Data Address
Other Data Address
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Byte pointer, 00h if not present
Reserved for future use
0Eh
1Bh
2A
04h
05h
8
06h
8
4Ch
54h
66h
6Ch
77h
0000h
07h
8
08h
8
09h
8
0Ah
0B-0Ch
0Dh
8
16
8
Reserved
Checksum
1 byte checksum
Add up by byte and take 2’s
complement
Processor Data
0E-13h
14h
48
S-spec Number
Six 8-bit ASCII characters
First seven bits reserved
7/1
Sample/Production
0b = Sample, 1b = Production
00000001 = production
15
6
2
Number of Cores
Number of Threads
[7:2] = Number of cores
[1:0] = Threads per core
00100010 = 8 cores with 2 threads
each
1
16-17h
18-19
16
16
System Bus Speed
Reserved
Four 4-bit hex digits (Mhz)
Reserved for future use
0133h = 133 MHz
0000h
146
Datasheet Volume 1 of 2
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