HP KC.32101.DMP Datasheet download pdf (Page 67)

Datasheet, Volume 1 67

Thermal Management

Table 5-1. Intel

Turbo Boost Technology Package Power Control Settings

MSR:

Address:

MSR_TURBO_POWER_LIMIT

610h

Control Bit Default Description

POWER_LIMIT_1 (PL1) 14:0 SKU TDP

This value sets the exponentially weighted moving

average power limit over a long time period. This is

normally aligned to the TDP of the part and steady-

state cooling capability of the thermal solution. This

limit may be set lower than TDP, real-time, for specific

needs such as responding to a thermal event. If set

lower than TDP, the processor may not be able to honor

this limit for all workloads since this control only applies

in the Turbo frequency range; a very high powered

application may exceed POWER_LIMIT_1, even at non-

Turbo frequencies. PL1 limit may be set slightly higher

than TDP. If set higher than TDP, the processor could

stay at that power level continuously and cooling

solution improvements may be required.

POWER_LIMIT_1_TIME

(Turbo Time Parameter)

23:17 1 sec

This value is a time parameter that adjusts the

algorithm behavior. The exponentially weighted moving

average Turbo algorithm will use this parameter to

maintain time averaged power at or below

POWER_LIMIT_1. The default value is 1 second, but

28 seconds is recommended for most mobile

applications.

POWER_LIMIT_2 (PL2) 46:32 1.25 x TDP

Establishes the upper power limit of Turbo operation

above TDP, primarily for platform power supply

considerations. Power may exceed this limit for up to

10 ms. The default for this limit is 1.25 x nominal TDP.

Setting this limit to TDP will limit the processor to only

operating up to TDP, but it does not disable Turbo.

Because Turbo is opportunistic and power/temperature

dependant, many workloads will allow some Turbo

frequencies at power at or below TDP.

Figure 5-1. Package Power Control

System Thermal Response Time

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 167 168

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HP KC.32101.DMP Datasheet Page 67

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