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5.9.2 Package 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:
Address:
MSR_TURBO_POWER_LIMIT
610h
Control Bit Default Description
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.
Figure 18. Package Power Control
5.9.3 Turbo 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
Thermal Management—Processor
Intel
®
Xeon
®
Processor E3-1200 v3 Product Family
June 2013 Datasheet – Volume 1 of 2
Order No.: 328907-001 75