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Case Fan Question

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a c 455 V Motherboard
February 2, 2012 10:49:37 PM

We know that 4-wire 12VDC case fans make use of PWM to control their speed, and that some motherboards can control the speed of 3-wire fans by varying the voltage to the motor. My question is, will a 2-wire fan also be able to have its speed controlled by varying the voltage? I realize the lack of a 3rd wire means there will be no tach feedback to monitor the speed.

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a c 180 V Motherboard
February 2, 2012 10:57:01 PM

Yes if you sre connecting it to a fan controller you will be able to adjust the speed and like you said you won't be able to monitor the speed.
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a c 455 V Motherboard
February 2, 2012 11:04:51 PM

inzone said:
Yes if you sre connecting it to a fan controller you will be able to adjust the speed and like you said you won't be able to monitor the speed.

Actually, I was refering to connecting it to the 3-pin CHA FAN connection on the motherboard. Most boards I've used with 3-pin CHA FAN headers vary the speed of 3-wire fans by voltage regulation. Since the 3rd wire is used for speed feedback, I was wondering if 2-wire fans would work the same (but no feedback).
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a c 180 V Motherboard
February 2, 2012 11:14:23 PM

Yes. But you may have to disable the monitoring of the fan in the bios so you don't get warning messages.
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a c 455 V Motherboard
February 2, 2012 11:27:39 PM

Good point about the warning msgs. Another thought... the 2 small 60mm fans have Molex connectors. Any problem plugging/wiring the fans together (in parallel) and then into one Molex to 3 pin fan adaptor?
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a c 180 V Motherboard
February 2, 2012 11:35:28 PM

It shouldn't be a problem but you don't want to overload the motherboard connector so two would be the limit.
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a c 455 V Motherboard
February 2, 2012 11:46:05 PM

Thanks for the advice. I'm planning a SFF gamer and the case in mind is the Thermaltake Lanbox with 2 60mm and 1 90mm case fans. I'd like to have the board's BIOS lower the fans' speed and noise when full cooling isn't needed. I really don't want to add a fan controller if I don't need to.
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a c 180 V Motherboard
February 2, 2012 11:50:39 PM

There are a lot of different types of fan controllers and there are some that fit in the slot in the rear of the case instead of the front and is just a basic knob that you could turn to raise or lower the fan speed.
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a c 455 V Motherboard
February 9, 2012 11:00:37 PM

Best answer selected by clutchc.
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a c 328 V Motherboard
February 9, 2012 11:06:04 PM

This topic has been closed by Nikorr
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