HAF 932 Advanced fans running at diferent speed in Maximus Hero

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LSDance

LSDance

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Aug 20, 2013
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Hello to everyone,

I just finished my first build and would like to ask some help because I'm a very new in computer hardware. After power up the system and enter in BIOS I saw that the case fans are running at different speeds:

Front ~ 438 RPM
Side ~ 438 RPM
Top ~ 266 RPM

The problem is that I don't know if one of the fans are defective or if is something else, because for me they should be running at same RPM isn't it? The connectors of the MB is 4 pin and the HAF fans 3 pin, but according to the people of the community this is no problem. Excuse my ignorance if this is a very simple question. I couldn't find no answer for that. Threads with same problem wasn't solved too. Thanks to everyone.

The hardware:

Core i5 4670K
Zalman 2 Ball Cooler Led
Asus Maximus VI Hero
2 x 4GB G.Skill Sniper 1600Mhz 1,25V
SSD Samsung 840 Pro 128GB
Seagate Barracuda 1TB
Seasonic X Series 650W
Cooler Master HAF 932 Advanced
EVGA GTX 770 ACX
 
Solution
Karadjgne
In the bios, the fans are probably set to Auto, so will run according to whatever the bios dictates. You can shift that to Manual, which basically sets the duty rates (% based on fan max speed), the rest is bios controlled. Only aftermarket software will be able to disable a fan, other than unplugging it. As you see from the Asus Suite II in the above post, I have Fan Expert 2 shut down my top exhaust 120mm fan if the case temp is below 30*C. Then it ramps up to 70% at 40*C and it will sit there till it reaches 70*C at which time the bios overrides the AI Suite, and sets the fan at 100%. I think its turned on 1/2 dozen times in the last year.

Power Fan is not controllable, that's the CPU_OPT header, which is also my liquid cooler pump...
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Xiembeest

Xiembeest

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Jun 24, 2013
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Are all the fans exactly the same make and model? If so, can you feel a significant diffirence in air flow if you place the worlds highest regarded measurement tool better known as your hand behind the fan?

If the answer on both questions is yes, you might have faulty sensor. Shouldn't be a big deal.
 
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LSDance

LSDance

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Aug 20, 2013
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I'm not sure about the models, need check first, but I believe that they are same model once I have not changed the stock fans of the case. I'll try to feel the airflow. Thanks for your attention dude.
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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HAF 932 Advanced has 4 stock fans, 1x140mm rear exhaust, 1x230mm top exhaust, 1x230mm side intake and 1x 230mm front intake.

Depending on temperature at certain points, fans will spin. There are several points where the motherboard will get temps from, socket, gpu, cpu, vrm etc. The Bios has an algorithm it uses to regulate the fan speeds, if it feels the cpu is too hot, it'll try and increase cpu fan speed etc, so yes, its entirely possible that you will see a difference in fan speeds, especially between intakes and exhaust.

You also have an Asus board, so may have the Asus software installed. Fan Expert will override the bios algorithms to a point, so if that also has fan settings for differing temp areas, your fans will spin at different speeds.

Also, the rear exhaust is a 1000 rpm fan, the 230mm's are 700 rpm fans, so those will have differing speeds also.

2dgwbk4.png
 
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LSDance

LSDance

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Aug 20, 2013
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I didn't list the rear fan because it was expected a different RPM because of the size. The user's guide of the MB is too poor of information about the case fans. I didn't install the OS yet for some reasons. So you suggest that if I disable the control of the 230mm fans in the BIOS they should run at ~700 RPM?
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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In the bios, the fans are probably set to Auto, so will run according to whatever the bios dictates. You can shift that to Manual, which basically sets the duty rates (% based on fan max speed), the rest is bios controlled. Only aftermarket software will be able to disable a fan, other than unplugging it. As you see from the Asus Suite II in the above post, I have Fan Expert 2 shut down my top exhaust 120mm fan if the case temp is below 30*C. Then it ramps up to 70% at 40*C and it will sit there till it reaches 70*C at which time the bios overrides the AI Suite, and sets the fan at 100%. I think its turned on 1/2 dozen times in the last year.

Power Fan is not controllable, that's the CPU_OPT header, which is also my liquid cooler pump, so would be max duty anyways.

Anyways, if you think you have a defective fan, swap 2 of them. Top exhaust and side panel should be the exact same fan. What you'll probably find is that the positions will remain at the same duty rate, regardless of fan. That's all bios, and you should be able to play with that somewhat.

If the fans spin at the same rate they did before the swap, then you probably have a defective fan. Its not unheard of, but it does happen, if rarely in a new case.

 
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