Thermal Management

The cpuModule has several thermal features which can be used to monitor and control the board’s temperature when extreme operating conditions are prevalent.

Thermal Monitor

The Intel ® Thermal Monitor is a feature on the CMX158886 that automatically initiates a SpeedStep transition or throttles the CPU when the CPU exceeds its thermal limit. The maximum temperature of the processor is defined as the temperature that the Thermal Monitor is activated. The thermal limit and duty cycle of the Thermal Monitor cannot be modified.

Note The CPU and PCB temperatures displayed in the BIOS are approximate and should not be used to validate a cooling solution.

Fan Mode

The CPU fan can be controlled by the CPU when connected to the switched fan power connector (CN15). Three fan modes are supported, which can be toggled in the BIOS setup. When the fan is not always on, the CPU’s power consumption is reduced, and the life of the fan is increased.

Always On: When in this mode, the fan is always powered by the CPU.

On At 70C: This mode allows the system to keep the fan turned off until the CPU reaches 70C. In this mode, the fan will slowly transition between on and off to prevent oscillations. This is the best mode for applications that will spend most of the time below 0C.

Variable: The fan will spin slowly until the CPU reaches 60C, and then will increase speed. Maximum speed is reached when the CPU reaches 75C.

Note If the CPU fan is connected to the continuous +5 V fan connector (CN14), changing the fan mode options in the BIOS will not affect the fan, as it will always be turned on.

Further Temperature Reduction

The cpuModule’s temperature is directly related to power consumption. Reducing the power consumption of the CPU will have an effect on the CPU’s temperature. Suggested methods for reducing the CPU’s power consumption can be found in the Power Management section on page 73.

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BDM-610000049 Rev G

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IBM BDM-610000049 user manual Thermal Management, Fan Mode, Further Temperature Reduction

BDM-610000049 specifications

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