Intel E7-4850 AT80615007449AA User Manual
Product codes
AT80615007449AA
Intel
®
Xeon
®
Processor E7-8800/4800/2800 Product Families
11
Specification Update
September 2012
Identification Information
Component Identification via Programming Interface
The Intel
®
Xeon
®
Processor E7-8800/4800/2800 Product Families stepping can be
identified by the following register contents:
When EAX is initialized to a value of ‘1’, the CPUID instruction returns the Extended
Family, Extended Model, Processor Type, Family Code, Model Number and Stepping ID
value in the EAX register. Note that the EDX processor signature value after reset is
equivalent to the processor signature output value in the EAX register.
Cache and TLB descriptor parameters are provided in the EAX, EBX, ECX and EDX
registers after the CPUID instruction is executed with a 2 in the EAX register.
Reserved
Extended
Family
1
Notes:
1. The Extended Family, bits [27:20] are used in conjunction with the Family Code, specified in bits [11:8], to
indicate whether the processor belongs to the Intel386™, Intel486™, Pentium®, Pentium® Pro, Pentium®
4, Intel® Core™ processor family or Intel® Core™ i7 family.
Extended
Model
2
2. The Extended Model, bits [19:16] in conjunction with the Model Number, specified in bits [7:4], are used to
identify the model of the processor within the processor’s family.
Reserved
Processor
Type
3
3. The Processor Type, specified in bits [13:12] indicates whether the processor is an original OEM processor,
an OverDrive processor, or a dual processor (capable of being used in a dual processor system).
Family
Code
4
4. The Family Code corresponds to bits [11:8] of the EDX register after RESET, bits [11:8] of the EAX register
after the CPUID instruction is executed with a 1 in the EAX register, and the generation field of the Device ID
register accessible through Boundary Scan.
Model
Number
5
5. The Model Number corresponds to bits [7:4] of the EDX register after RESET, bits [7:4] of the EAX register
after the CPUID instruction is executed with a 1 in the EAX register, and the model field of the Device ID
register accessible through Boundary Scan.
Stepping
ID
6
6. The Stepping ID in bits [3:0] indicates the revision number of that model. See
for the processor
stepping ID number in the CPUID information.
31:28
27:20
19:16
15:14
13:12
11:8
7:4
3:0
00000000b
0010b
00b
0110
1111b
0000b