Acer E3-1220 v3 KC.12201.3E3 用户手册

The package power control allows for customization to implement optimal turbo within

platform power delivery and package thermal solution limitations.

POWER_LIMIT_1 (PL1)

14:0

SKU TDP

• 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

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
(Turbo Time Parameter)

23:17

1 sec

This value is a time parameter that adjusts the algorithm

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

hardware default value is 1 second, but 28 seconds is

recommended for most mobile applications.

POWER_LIMIT_2 (PL2)

46:32

1.25 x TDP

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

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.

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