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BIOS Fan Control
We tested the board's fan control by connecting the CPU cooler's fan to a variable
DC fan controller, so we could lower it as necessary, and proceeded to stress
the processor using Prime95 while monitoring fan speeds using PC Probe. A Scythe
92mm PWM fan (2500 RPM) was connected to the CPU_FAN header, a Scythe Kama Flow
80mm 3-pin fan (1600 RPM) to the CHA_FAN1 header, and a Nexus 92mm 3-pin fan
(1400 RPM) to the CHA_FAN2 header.
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Fan Control Results (Silent mode)
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Test State
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CPU_FAN
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CHA_FAN1
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CHA_FAN2
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Min. Speed
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660 RPM
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420 RPM
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490 RPM
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Max. Speed
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2450 RPM
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1610 RPM
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1350 RPM
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Trigger Temp.
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44°C
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51°C
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Temp. Range
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10°C
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Q-Fan in Silent mode produced very good fan control results. All three fans
spun at approximately 25% speed when idle. The CPU fan began increasing in speed
when the temperature reached 44°C and the Chassis fans followed suit at
51°C. It took a 10°C increase before all the fans reached their nominal
speeds. The fan speed progression was fairly smooth.
SpeedFan Support
For Windows, SpeedFan is our application of choice for fan control. It
can be configured to raise or lower multiple fan speeds to designated limits
when any specified temperature threshold is breached.
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SpeedFan with correlations entered.
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SpeedFan reported the fan speeds of all four of the onboard fan headers. Temp1
matched the CPU temperature readout in Asus Probe, and Temp2 matched "MB"
which, through thermal testing we determined to be related to the temperature
of the southbridge — placing a fan over the southbridge heatsink under
load resulted in a significant decrease in the Temp2 reading.
The CPU and Chassis fans can all be controlled independently through SpeedFan.
Speed01 controls fans connected to the CPU fan header using PWM, while Speed02
works on both PWM and regular 3-pin fans. Speed03 controls the CHA_FAN1 header
and Speed04 controls the CHA_FAN2 header. To enable full fan control, select
the "IT8712F-J" chip in the Advanced tab of the Configuration menu
and set all the PWM modes to "Software Controlled."
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