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Old July 21, 2010, 11:02 AM
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Default 120mm full speed @ 5V fan?

I'm about to build a new system on an Asus MB that has monitoring and automatic adjustments for the CPU + 3 chasis fan.

Two of the chasis fan connectors are of the normal 3-pin 12V case fan variety (which I'll be using for my rear and top exhaust fans... or possibly rear + intake) but the third is a 4-pin 5V which I assume would normally take a small chipset or ram cooling fan.

Are there any larger 120mm fans that would rotate at full speed on 5V? I have some 120's that work at the normal 5/7/12V but 5 is the quiet, low airflow setting.
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Old July 21, 2010, 11:05 AM
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No fans will run at full speed on 5V. Are you sure the port only outputs 5V? Four pins generally means it's for PWM fans which should allow a full range of voltage adjustment between 5V and 12V.
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Old July 21, 2010, 11:21 AM
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I'm looking at the manual and CHA_FAN2 and CHA_FAN3 both have their pins labeled-from top to bottom as: GND/+12V/Rotation but CHA_FAN1 has 4 pins labeled: +5V/CHA FAN IN/CHA FAN PWR/Gnd.

The location of the connectors has fan1 just behind the ram slots, fan2 at the front near the rear case exhaust and fan3 at the rear behind the primary video card slot.

This is on a P6X-58D-E by the way.
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Old July 21, 2010, 11:24 AM
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It's a normal PWM fan connector. The CHA FAN PWR pin is +12V. Any fan will work.
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Old July 21, 2010, 11:25 AM
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Awesome. Thanks for your help.
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