35-212 Vol. 3C
MODEL-SPECIFIC REGISTERS (MSRS)
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.”
61EH
1566
MSR_PCIE_PLL_RATIO
Package
Configuration of PCIE PLL Relative to BCLK(R/W)
1:0
Package
PCIE Ratio (R/W)
00b: Use 5:5 mapping for100MHz operation (default)
01b: Use 5:4 mapping for125MHz operation
10b: Use 5:3 mapping for166MHz operation
11b: Use 5:2 mapping for250MHz operation
2
Package
LPLL Select (R/W)
if 1, use configured setting of PCIE Ratio
3
Package
LONG RESET (R/W)
if 1, wait additional time-out before re-locking Gen2/Gen3 PLLs.
63:4
Reserved
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.
2
Power Budget Management Status (R0)
When set, frequency is reduced below the operating system
request due to PBM limit
3
Platform Configuration Services Status (R0)
When set, frequency is reduced below the operating system
request due to PCS limit
4
Reserved.
5
Autonomous Utilization-Based Frequency Control Status (R0)
When set, frequency is reduced below the operating system
request because the processor has detected that utilization is low
Table 35-30. Additional MSRs Supported by Intel® Xeon® Processor E5 v3 Family
Register
Address
Register Name
Scope
Bit Description
Hex
Dec