Hiper Media Center PC HMC-2K53A-A3

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SpeedFan, the popular hardware monitoring software, was used to analyze the BIOS Smart Fan's behavior. The first step was to determine which temperatures were legitimate and which were erroneous. "Temp2" at -128°C was discounted first for obvious reasons. "Core" is read directly from the CPU on AMD processors, leaving "Temp1" and "Temp3" unaccounted for. When we stressed the system with CPUBurn and looked at the temperatures, it appeared that "Temp3" increased and followed "Core" very closely, making it a likely candidate for the motherboard's CPU temperature sensor and we will refer to it as such from now on. "Temp1" on the other hand only rose by approximately 5°C and pointing a case fan at either the southbridge or northbridge did not reduce this temperature, so we were not able to pin down exactly what this reading corresponded to. As for fan RPM reporting, "Fan1" corresponded to the fan hooked up to the 4-pin CPU fan header, while "Fan3" corresponded to the 3-pin auxilary fan header (the motherboard only has two).

SpeedFan readings.

We set Smart Fan's target temperature to 40°C and the minimum fan speed to 37.5%, stressed the system with CPUBurn, watching SpeedFan for changes. The CPU fan speed fluttered between 770 and 850 RPM until the temperature hit 35°C. The fan speed then increased gradually to 950 RPM at 38°C and then spiked to 1180RPM at 39°C. At 40°C and above the fan speed varied between 1200 and 1300 RPM. So Smart Fan worked more or less as it was designed to. It should be noted that from a silent PC perspective, it doesn't really matter since the CPU fan is inaudible in the system compared to the power supply fans.

Smart Fan settings.

Also, manual or automatic control is possible. In the Advanced menu, under the "F71882F" chip, "PWM 4 mode" must be set to "Manual set PWM" and "PWM 1 Type" must be set to either "PWM mode (3-wire)" or "Linear DC mode." Once this is done a 3-pin fan connected to the CPU fan header can be fully controlled by the user via the "Speed01" setting. There was a 3 to 5 second delay when changing the fan speed manually.

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