Vol. 3C 35-231
MODEL-SPECIFIC REGISTERS (MSRS)
23:16
Package
Maximum Ratio Limit for 11C
31:24
Package
Maximum Ratio Limit for 12C
39:32
Package
Maximum Ratio Limit for 13C
47:40
Package
Maximum Ratio Limit for 14C
55:48
Package
Maximum Ratio Limit for 15C
63:56
Package
Maximum Ratio Limit for 16C
606H
1542
MSR_RAPL_POWER_UNIT
Package
Unit Multipliers used in RAPL Interfaces (R/O)
3:0
Package
Power Units
See Section 14.9.1, “RAPL Interfaces.”
7:4
Package
Reserved
12:8
Package
Energy Status Units
Energy related information (in Joules) is based on the multiplier,
1/2^ESU; where ESU is an unsigned integer represented by bits
12:8. Default value is 0EH (or 61 micro-joules)
15:13
Package
Reserved
19:16
Package
Time Units
See Section 14.9.1, “RAPL Interfaces.”
63:20
Reserved
618H
1560
MSR_DRAM_POWER_LIMIT
Package
DRAM RAPL Power Limit Control (R/W)
See Section 14.9.5, “DRAM RAPL Domain.”
619H
1561
MSR_DRAM_ENERGY_
STATUS
Package
DRAM Energy Status (R/O)
Energy consumed by DRAM devices
31:0
Energy in 15.3 micro-joules. Requires BIOS configuration to enable
DRAM RAPL mode 0 (Direct VR).
63:32
Reserved
61BH
1563
MSR_DRAM_PERF_STATUS
Package
DRAM Performance Throttling Status (R/O) See Section 14.9.5,
61CH
1564
MSR_DRAM_POWER_INFO
Package
DRAM RAPL Parameters (R/W)
See Section 14.9.5, “DRAM RAPL Domain.”
639H
1593
MSR_PP0_ENERGY_STATUS Package
Reserved (R/O)
Reads return 0
690H
1680
MSR_CORE_PERF_LIMIT_RE
ASONS
Package
Indicator of Frequency Clipping in Processor Cores (R/W)
(frequency refers to processor core frequency)
0
PROCHOT Status (R0)
When set, processor core frequency is reduced below the operating
system request due to assertion of external PROCHOT.
1
Thermal Status (R0)
When set, frequency is reduced below the operating system
request due to a thermal event.
Table 35-34. Additional MSRs Common to Intel® Xeon® Processor D and Intel Xeon Processors E5 v4 Family Based
on the Broadwell Microarchitecture
Register
Address
Register Name
Scope
Bit Description
Hex
Dec