Vol. 3C 35-1

CHAPTER 35

MODEL-SPECIFIC REGISTERS (MSRS)

This chapter lists MSRs across Intel processor families. All MSRs listed can be read with the RDMSR and written with 
the WRMSR instructions. 
Register addresses are given in both hexadecimal and decimal. The register name is the mnemonic register name 
and the bit description describes individual bits in registers.
Model specific registers and its bit-fields may be supported for a finite range of processor families/models. To distin-
guish between different processor family and/or models, software must use CPUID.01H leaf function to query the 
combination of DisplayFamily and DisplayModel to determine model-specific availability of MSRs (see CPUID 
instruction in Chapter 3, “Instruction Set Reference, A-L” in the Intel® 64 and IA-32 Architectures Software Devel-
oper’s Manual, Volume 2A). Table 35-1 lists the signature values of DisplayFamily and DisplayModel for various 
processor families or processor number series.

Table 35-1.  CPUID Signature Values of DisplayFamily_DisplayModel 

DisplayFamily_DisplayModel Processor Families/Processor Number Series
06_57H

Intel® Xeon Phi™ Processor 3200, 5200, 7200 Series

06_8EH, 06_9EH

Future Intel® Core Processors 

06_55H

Future Intel® Xeon Processors 

06_4EH, 06_5EH

6th generation Intel Core processors and Intel Xeon processor E3-1500m v5 product family and E3-

1200 v5 product family based on Skylake microarchitecture

06_56H

Intel Xeon processor D-1500 product family based on Broadwell microarchitecture

06_4FH

Intel Xeon processor E5 v4 Family based on Broadwell microarchitecture, Intel Xeon processor E7 v4 

Family, Intel Core i7-69xx Processor Extreme Edition

06_47H

5th generation Intel Core processors, Intel Xeon processor E3-1200 v4 product family based on 

Broadwell microarchitecture

06_3DH

Intel Core M-5xxx Processor, 5th generation Intel Core processors based on Broadwell 

microarchitecture

06_3FH

Intel Xeon processor E5-4600/2600/1600 v3 product families, Intel Xeon processor E7 v3 product 

families based on Haswell-E microarchitecture, Intel Core i7-59xx Processor Extreme Edition

06_3CH, 06_45H, 06_46H

4th Generation Intel Core processor and Intel Xeon processor E3-1200 v3 product family based on 

Haswell microarchitecture

06_3EH

Intel Xeon processor E7-8800/4800/2800 v2 product families based on Ivy Bridge-E 

microarchitecture

06_3EH

Intel Xeon processor E5-2600/1600 v2 product families and Intel Xeon processor E5-2400 v2 

product family based on Ivy Bridge-E microarchitecture, Intel Core i7-49xx Processor Extreme Edition

06_3AH

3rd Generation Intel Core Processor and Intel Xeon processor E3-1200 v2 product family based on Ivy 

Bridge microarchitecture

06_2DH

Intel Xeon processor E5 Family based on Intel microarchitecture code name Sandy Bridge, Intel Core 

i7-39xx Processor Extreme Edition

06_2FH

Intel Xeon Processor E7 Family

06_2AH

Intel Xeon processor E3-1200 product family; 2nd Generation Intel Core i7, i5, i3 Processors 2xxx 

Series

06_2EH

Intel Xeon processor 7500, 6500 series

06_25H, 06_2CH

Intel Xeon processors 3600, 5600 series, Intel Core i7, i5 and i3 Processors

06_1EH, 06_1FH

Intel Core i7 and i5 Processors