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Asus Fan Xpert and 3 pin fan control?

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a b V Motherboard
November 7, 2013 9:42:38 AM

How does Fan Xpert control the speed of 3 pin fans? I'm going to be using Corsair AF140's with a Maxmius Formula. Also how easy is it for me to change the speed of the fan? I don't have it yet and was wondering.

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a c 92 V Motherboard
November 7, 2013 10:12:58 AM

It controls them just fine. a 3 pin fan is voltage controlled, 1 pin for ground, 1 pin for voltage, usually 5-12v, and 1 that reports back the RPM of the fan, so the software just regulates how much voltage goes to the fans to control the speed.

A 4pin fan has the same 3 pins but instead gets a constant 12v voltage and the speed is controled from the 4th pin, a pulse modulation width signal, or PWM.

Which one is better? Meh. Both do the same job.
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December 9, 2013 5:11:21 AM

getochkn said:
It controls them just fine. a 3 pin fan is voltage controlled, 1 pin for ground, 1 pin for voltage, usually 5-12v, and 1 that reports back the RPM of the fan, so the software just regulates how much voltage goes to the fans to control the speed.

A 4pin fan has the same 3 pins but instead gets a constant 12v voltage and the speed is controled from the 4th pin, a pulse modulation width signal, or PWM.

Which one is better? Meh. Both do the same job.


Hi getochkn,
I have recently got a new rig which has a manual fan controller in the front panel. The case is a Fractal R4 and currently the fan speeds are changed using the front panel.

If I want the mobo software to control the fan speeds automatically instead, do I need to rip the case open and start re-connecting wires, etc? I am not the most technical and this is pretty nerve wracking as the rig was built for me. I am not even sure how to get into the motherboard program to control the speeds in the first place !! I have 2 fans in front panel and 1 in the rear.

Motherboard is ASUS Z87 A, GTX 780 Ti and i5 4670k (not overclocked)

Thanks in advance.

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June 6, 2014 9:52:35 PM

You can keep the manual controls turned all the way up, and from then on,don't touch them anymore. Just control the fans via the software. I've been doing that, but since I'm not in the process of changing out the fans that came with the case to a different brand, I'm removing the manual control altogether.
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a b V Motherboard
June 7, 2014 1:48:50 AM

The only header that requires a 4-pin fan is the CPU fan header. The rest of the fan headers will accept either type to control fan RPM.
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a c 92 V Motherboard
June 7, 2014 6:52:12 AM

terry4536 said:
The only header that requires a 4-pin fan is the CPU fan header. The rest of the fan headers will accept either type to control fan RPM.


CPU fans work fine with 3 pin fans as well.
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a b V Motherboard
June 7, 2014 1:59:55 PM

My motherboard doesn't work that way. It will go to 100% every time on the CPU header. If I move it to another header it works fine.

I just looked it up in my manual. "Only 4-pin CPU fans and 4-pin and 3-pin chassis fans are compatible with Fan Xpert 2." page 4-14 of the Asus Maximus V Formula Series Motherboard User Guide (Damn Long Title).
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a b V Motherboard
June 7, 2014 2:04:07 PM

I ran into this because the Noctua NH-D14 CPU cooler has 3-pin fans. I ended up using the 140 mm fan on another header and purchased two more PWM fans for the cooler.
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