Thermal Management—Processor

5.9.2Package Power Control

The package power control allows for customization to implement optimal turbo within platform power delivery and package thermal solution limitations.

Table 21.

Intel® Turbo Boost Technology 2.0 Package Power Control Settings

MSR:

 

MSR_TURBO_POWER_LIMIT

Address:

 

610h

 

 

 

 

 

 

Control

Bit

Default

Description

 

 

 

 

 

 

 

 

 

• This value sets the 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. The

 

 

 

 

default value is the TDP for the SKU.

 

 

 

 

• PL1 limit may be set lower than TDP in real time for specific

 

 

 

 

needs, such as responding to a thermal event. If it is set

POWER_LIMIT_1 (PL1)

14:0

SKU TDP

lower than TDP, the processor may require to use frequences

below the guaranteed P1 frequency to control to the low

 

 

 

 

 

 

 

 

power limits. The PL1 Clamp bit [16] should be set to enable

 

 

 

 

the processor to use frequencies below P1 to control to the set

 

 

 

 

power limit.

 

 

 

 

• PL1 limit may be set 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

 

 

This value is a time parameter that adjusts the algorithm

23:17

1 sec

behavior to maintain time averaged power at or below PL1. The

(Turbo Time Parameter)

hardware default value is 1 second, but 28 seconds is

 

 

 

 

 

 

recommended for most mobile applications.

 

 

 

 

 

 

 

 

 

PL2 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 TDP but the BIOS may reprogram it to maximize the

POWER_LIMIT_2 (PL2)

46:32

1.25 x TDP

performance within platform power supply considerations. Setting

 

 

 

 

this limit to TDP will limit the processor to only operate up to

 

 

 

 

TDP. It does not disable turbo because turbo is opportunistic and

 

 

 

 

power/temperature dependent. Many workloads will allow some

 

 

 

 

turbo frequencies for powers at or below TDP.

 

 

 

 

 

Figure 18. Package Power Control

5.9.3Turbo Time Parameter

Turbo Time Parameter is a mathematical parameter (units in seconds) that controls the Intel Turbo Boost Technology algorithm using an average of energy usage. During a maximum power turbo event of about 1.25 x TDP, the processor could sustain

 

Intel® Xeon® Processor E3-1200 v3 Product Family

June 2013

Datasheet – Volume 1 of 2

Order No.: 328907-001

75