Vol. 3C 35-89

MODEL-SPECIFIC REGISTERS (MSRS)

1A4H

420

MSR_MISC_FEATURE_

CONTROL

Miscellaneous Feature Control (R/W) 

0

Core

L2 Hardware Prefetcher Disable (R/W) 
If 1, disables the L2 hardware prefetcher, which fetches additional 

lines of code or data into the L2 cache.

1

Reserved

2

Core

DCU Hardware Prefetcher Disable (R/W) 
If 1, disables the L1 data cache prefetcher, which fetches the next 

cache line into L1 data cache.

63:3

Reserved.

1AAH

426

MSR_MISC_PWR_MGMT

Package

See http://biosbits.org.

0

EIST Hardware Coordination Disable (R/W)
When 0, enables hardware coordination of Enhanced Intel 

Speedstep Technology request from processor cores; When 1, 

disables hardware coordination of Enhanced Intel Speedstep 

Technology requests.

21:1

Reserved.

22

Thermal Interrupt Coordination Enable (R/W) 
If set, then thermal interrupt on one core is routed to all cores.

63:23

Reserved.

1ADH

429

MSR_TURBO_RATIO_LIMIT

Package

Maximum Ratio Limit of Turbo Mode by Core Groups (RW)
Specifies Maximum Ratio Limit for each Core Group. Max ratio 

for groups with more cores must decrease monotonically.
For groups with less than 4 cores, the max ratio must be 32 or 

less. For groups with 4-5 cores, the max ratio must be 22 or 

less. For groups with more than 5 cores, the max ratio must be 

16 or less.

7:0

Package

Maximum Ratio Limit for Active cores in Group 0
Maximum turbo ratio limit when number of active cores is less or 

equal to Group 0 threshold. 

15:8

Package

Maximum Ratio Limit for Active cores in Group 1
Maximum turbo ratio limit when number of active cores is less or 

equal to Group 1 threshold and greater than Group 0 threshold. 

23:16

Package

Maximum Ratio Limit for Active cores in Group 2
Maximum turbo ratio limit when number of active cores is less or 

equal to Group 2 threshold and greater than Group 1 threshold. 

31:24

Package

Maximum Ratio Limit for Active cores in Group 3
Maximum turbo ratio limit when number of active cores is less or 

equal to Group 3 threshold and greater than Group 2 threshold. 

39:32

Package

Maximum Ratio Limit for Active cores in Group 4
Maximum turbo ratio limit when number of active cores is less or 

equal to Group 4 threshold and greater than Group 3 threshold. 

Table 35-12.   MSRs in Next Generation Intel Atom Processors Based on the Goldmont Microarchitecture (Contd.)

Address

Register Name

Scope

Bit Description

 Hex

Dec