User Guide

Thermal Management
84 Datasheet, Volume 1 of 2
In each mode, the Intel Turbo Boost Technology 2.0 power limits are reprogrammed
along with a new OS controlled frequency range. The DPTF driver assists in all these
operations. The cTDP mode does not change the max per-processor IA core turbo
frequency.
5.1.4.2 Low-Power Mode
Low-Power Mode (LPM) can provide cooler and quieter system operation. 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.
5.1.5 Thermal Management Features
Occasionally the processor may operate in conditions that are near to its maximum
operating temperature. This can be due to internal overheating or overheating within
the platform. In order to protect the processor and the platform from thermal failure,
several thermal management features exist to reduce package power consumption and
thereby temperature in order to remain within normal operating limits. Furthermore,
the processor supports several methods to reduce memory power.
5.1.5.1 Adaptive Thermal Monitor
The purpose of the Adaptive Thermal Monitor is to reduce processor IA core power
consumption and temperature until it operates below its maximum operating
temperature. Processor IA core power reduction is achieved by:
• Adjusting the operating frequency (using the processor IA core ratio multiplier) and
voltage.
• Modulating (starting and stopping) the internal processor IA core clocks (duty
cycle).
The Adaptive Thermal Monitor can be activated when the package temperature,
monitored by any digital thermal sensor (DTS), meets its maximum operating
temperature. The maximum operating temperature implies maximum junction
temperature Tj
MAX
.
Reaching the maximum operating temperature activates the Thermal Control Circuit
(TCC). When activated the TCC causes both the processor IA core and graphics core to
reduce frequency and voltage adaptively. The Adaptive Thermal Monitor will remain
TDP-Up The SKU-specific processor IA core frequency where manufacturing confirms logical
functionality within the set of operating condition limits specified for the SKU segment
and Configurable TDP-Up configuration in Table 5-2, Table 5-3 and Table 5-5. The
Configurable TDP-Up Frequency and corresponding TDP is higher than the processor IA
core Base Frequency and SKU Segment Base TDP.
TDP-Down The processor IA core frequency where manufacturing confirms logical functionality
within the set of operating condition limits specified for the SKU segment and
Configurable TDP-Down configuration in Table 5-2, Table 5-3 and Table 5-5. The
Configurable TDP-Down Frequency and corresponding TDP is lower than the processor IA
core Base Frequency and SKU Segment Base TDP.
Table 5-1. Configurable TDP Modes (Sheet 2 of 2)
Mode Description