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2017
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8.1.4
Thermal Management
ACPI is responsible for allowing the operating system to play an important part in the system’s thermal management. This results in the
operating system having the ability to take control of the operating environment by implementing cooling decisions according to the demands
put on the CPU by the application.
The conga-TS175 supports Critical Trip Point. This cooling policy ensures that the operating system shuts down properly if the temperature in
the thermal zone reaches a critical point, in order to prevent damage to the system as a result of high temperatures. Use the “critical trip point”
setup node in the BIOS setup program to determine the temperature threshold that the operating system will use to shut down the system.
The Automatic Critical Trip Point BIOS setting shuts down the system 5°C above the maximum specified temperature of the processor.
To cool the processor passively, use the Thermal Control Circuit (TCC ) Activation Offset setting in the CPU configuration setup sub-menu. The
TCC in the processor is activated at 100°C by default but can be lowered by the Activation Offset - for example, setting 10 activates TCC at
90°C. ACPI OS support is not required.
Note
Use the setup nodes in the BIOS setup program to establish the appropriate trip points.
8.1.5
Processor Performance Control
Intel
®
processors found on the conga-TS175 run at different voltage/frequency states (performance states), which is referred to as Enhanced
Intel
®
SpeedStep
®
technology (EIST). Operating systems that support performance control take advantage of microprocessors that use several
different performance states in order to efficiently operate the processor when it’s not being fully used. The operating system will determine
the necessary performance state that the processor should run at so that the optimal balance between performance and power consumption
can be achieved during runtime.
The Windows family of operating systems links its processor performance control policy to the power scheme setting. You must ensure that the
power scheme setting you choose has the ability to support Enhanced Intel
®
SpeedStep
®
technology.
The 7th Generation
Intel
®
Core™
processor family supports Intel Speed Shift, a new and energy efficient method for frequency control. This
feature is also referred to as Hardware-controlled Performance States (HWP). It is a hardware implementation of the ACPI defined Collaborative
Processor Performance Control (CPPC2) and is supported by newer operating systems (Win 8.1 or newer).
With this feature enabled, the processor autonomously selects performance states based on workload demand and thermal limits while also
considering information provided by the OS e.g., the performance limits and workload history.
