Intel CW8064701487007 Datasheet download pdf (Page 78)

Thermal Management

78 Datasheet, Volume 1

The temperature at which the Adaptive Thermal Monitor activates the thermal control

circuit is factory calibrated and is not user configurable. The default value is software

visible in the TEMPERATURE_TARGET (1A2h) MSR, bits 23:16. The Adaptive Thermal

Monitor does not require any additional hardware, software drivers, or interrupt

handling routines. The Adaptive Thermal Monitor is not intended as a mechanism to

maintain processor TDP. The system design should provide a thermal solution that can

maintain TDP within its intended usage range.

Note: Adaptive Thermal Monitor protection is always enabled.

5.6.1.1 TCC Activation Offset

TCC Activation Offset can be used to activate the TCC at temperatures lower than

J,max

. It is the preferred thermal protection mechanism for Intel Turbo Boost operation

since ACPI passive throttling states will pull the processor out of Turbo mode operation

when triggered. An offset (in degrees Celsius) can b e written

to=[]\TEMPERATURE_TARGET (1A2h) MSR, bits 27:24. This value will be subtracted

from the value found in bits 23:16. The default offset is 0 °C, where throttling will occur

at T

J,max

. The offset should be set lower than any other protection such as ACPI _PSV

trip points.

5.6.1.2 Frequency / Voltage Control

Upon TCC activation, the processor core attempts to dynamically reduce processor core

power by lowering the frequency and voltage operating point. The operating points are

automatically calculated by the processor core itself and do not require the BIOS to

program them as with previous generations of Intel processors. The processor core will

scale the operating points such that:

• The voltage will be optimized according to the temperature, the core bus ratio, and

number of cores in deep C-states.

• The core power and temperature are reduced while minimizing performance

degradation.

Once the temperature has dropped below the maximum operating temperature,

operating frequency and voltage transition will go back to the normal system operating

point. This is illustrated in Figure 5-2.

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Intel CW8064701487007 Datasheet Page 78