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Datasheet, Volume 1 73
Thermal Management
The cTDP consists of three modes as shown in Table 5-2.
In each mode, the Intel Turbo Boost Technology power and frequency ranges are
reprogrammed and the operating system is given a new effective HFM operating point.
The driver assists in all these operations. The cTDP mode does not change the
maximum Turbo frequency.
5.4.2 Low Power Mode
Low Power Mode (LPM) can provide an operation point at lower power than TDP-down.
By combining several active power limiting techniques, the processor can consume less
power while running at equivalent low frequencies. Active power is defined as processor
power consumed while a workload is running and does not refer to the power
consumed during idle modes of operation. LPM is only available using the Intel DPTF
driver.
Through the DPTF driver, LPM can be configured to use each of the following methods
to reduce active power:
Restricting Turbo Boost Power limits and IA core Turbo Boost availability
Off-Lining core activity (Move processor traffic to a subset of cores)
Placing an IA Core at LFM or MFM (Minimum Frequency Mode)
Utilizing IA clock modulation
Off-lining core activity is the ability to execute a workload on a limited subset of cores.
in conjunction with a lower Turbo power limit. However, not all processor activity is
ensured to be able to shift to a subset of cores. Shifting a workload to a limited subset
of cores allows other cores to remain idle and save power. Therefore, when LPM is
enabled with core offlining, less power is consumed at equivalent frequencies.
Minimum Frequency Mode (MFM) of operation has been incorporated into the processor
to allow clocked frequencies at or below the Low Frequency Mode (LFM). When MFM is
lower than LFM, it allows more active power reduction versus LFM.
Table 5-2. Configurable Thermal Design Power (cTDP) Modes
Mode Description
Nominal This is the processor’s rated frequency and TDP.
TDP-Up
When extra cooling is available, this mode specifies a higher TDP and higher ensured
frequency versus the nominal mode.
TDP-Down
When a cooler or quieter mode of operation is desired, this mode specifies a lower TDP and
lower ensured frequency versus the nominal mode.
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