•Uncharacterized workloads may exist that could result in higher turbo frequencies and power. If that were to happen, the processor Thermal Control Circuitry (TCC) would protect the processor. The TCC protection must be enabled by the platform for the product to be within specification.
An illustration of Intel Turbo Boost Technology power control is shown in the following sections and figures. Multiple controls operate simultaneously allowing for customization for multiple system thermal and power limitations. These controls provide turbo optimizations within system constraints.
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 28. | Intel® Turbo Boost Technology 2.0 Package Power Control Settings | ||||
MSR: |
| MSR_TURBO_POWER_LIMIT | |||
Address: |
| 610h |
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Control | Bit | Default | Description | ||
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| • This value sets the average power limit over a long time | |
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| period. This is normally aligned to the TDP of the part and | |
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| default value is the TDP for the SKU. | |
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| • PL1 limit may be set lower than TDP in real time for specific | |
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| 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 frequencies | ||
below the guaranteed P1 frequency to control the | |||||
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| limits. The PL1 Clamp bit [16] should be set to enable the | |
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| processor to use frequencies below P1 to control the set- | |
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| power limit. | |
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| • PL1 limit may be set higher than TDP. If set higher than TDP, | |
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| the processor could stay at that power level continuously and | |
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| cooling solution improvements may be required. | |
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POWER_LIMIT_1_TIME |
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| 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; however, 28 seconds is | ||||
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| recommended for most mobile applications. | |
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| PL2 establishes the upper power limit of turbo operation above | |
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| TDP, primarily for platform power supply considerations. Power | |
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| may exceed this limit for up to 10 ms. The default for this limit is | |
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| 1.25 x TDP; however, the BIOS may reprogram the default value | |
POWER_LIMIT_2 (PL2) | 46:32 | 1.25 x TDP | to maximize the performance within platform power supply | ||
considerations. Setting this limit to TDP will limit the processor to | |||||
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| only operate up to the TDP. It does not disable turbo because | |
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| turbo is opportunistic and power/temperature dependent. Many | |
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| workloads will allow some turbo frequencies for powers at or | |
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| below TDP. | |
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Desktop 4th Generation Intel® Core™ Processor Family, Desktop Intel® Pentium® Processor Family, and Desktop Intel® Celeron® Processor Family
Datasheet – Volume 1 of 2 80
