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Motherboard causes chassis fan to spin at max

post #1 of 20
Thread Starter 
Hello,

I bought an ASRock A780LM a while back to use for my parents' rig, and I recently got around to putting it together, and I've been having one problem. For the life of me, I CANNOT figure out how to get my chassis/case fan to stop spinning at full speed! I've tried this mobo in two different cases, and in both cases, the case fan will spin at maximum speed, which annoys me (and my parents) a lot.

Is there some setting in the BIOS that I should be looking for to stop this from happening? The strangest part is that, of the 75 Newegg reviews of this board, not a single person reported the same thing happening, so I'm guessing that my issue is isolated... Any advice or suggestions would be greatly appreciated.

Edit Oh, and I've also made sure that the chassis fans are at fault by using other motherboards to test them.
Edited by onoz - 2/20/11 at 10:58pm
 
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post #2 of 20
Isn't there a program that controls fan speed like Speed Fan or something? I think fan control is limited on some motherboards. I know the one (in my sig) has it, but my desktop build does not.

Make sure your case fan is plugged into the case fan plug of your motherboard and not CPU or something along those lines.
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post #3 of 20
Is there a "smart fan control" option in the BIOS?
post #4 of 20
Thread Starter 
Quote:
Originally Posted by Limes;12465150 
Isn't there a program that controls fan speed like Speed Fan or something? I think fan control is limited on some motherboards. I know the one (in my sig) has it, but my desktop build does not.

Make sure your case fan is plugged into the case fan plug of your motherboard and not CPU or something along those lines.
I'll have to look into Speed Fan, but as far as controls in BIOS, I haven't been able to find a single control that helps with this.

I can confirm that my case fan is connected properly. My case fan goes to a 3-pin connector (thingy) labeled "CHA_FAN1" and my CPU fan goes to a 4-pin another labeled "CPU_FAN1". I'm reading these labels right off my motherboard, and not from the manual.
Quote:
Originally Posted by xd_1771;12465204 
Is there a "smart fan control" option in the BIOS?
Lemme look.

EDIT I've attached some pictures (apologies for the quality). I don't see anything that even hints at a chassis fan.
Edited by onoz - 2/21/11 at 12:20am
 
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post #5 of 20
Thread Starter 
Sorry for double post. I edited my above post with more info.
 
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post #6 of 20
You have 2 programs for controlling fan speed.Turn that crap Asus Quiet Fan to disabled.Go to advanced tab I believe and enable AMD Cool & Quiet.
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post #7 of 20
Thread Starter 
Quote:
Originally Posted by Redwoodz;12465731 
You have 2 programs for controlling fan speed.Turn that crap Asus Quiet Fan to disabled.Go to advanced tab I believe and enable AMD Cool & Quiet.
Changed Cool'n'Quiet from Auto to Enabled, disabled Quiet Fan. My case fan is still spinning at maximum speed, and now my CPU fan seems a bit louder (though of course, not as loud as my case fan).
Edited by onoz - 2/21/11 at 12:43am
 
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post #8 of 20
Perhaps your CPU fan was indeed being controlled (being 4-pin PWM).... your case fan, being 3-pin I assume, was not. You may have to get a different quieter fan or a silencer cable to 7V or 5V.
post #9 of 20
The only control you have in BIOS is for a 4 pin PWM fan connected to the CPU_fan header.

Your motherboard does not support fan control on fans connected to the chassis_fan 3 pin header in the BIOS. You can try to adjust it with speedfan, but not all motherboards have the ability to vary voltage to the fan headers on them. If speedfan will not control the fan speed, your only choice is to replace the fan with a PWM fan, and chain it to the PWM control of the CPU fan header, install a manual fan speed control, or as xd_1771 suggested, install resistor wires to slow the existing fans down, or replace them with quieter fans.
Edited by xandypx - 2/21/11 at 8:22am
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post #10 of 20
Thread Starter 
Quote:
Originally Posted by xandypx;12468438 
The only control you have in BIOS is for a 4 pin PWM fan connected to the CPU_fan header.

Your motherboard does not support fan control on fans connected to the chassis_fan 3 pin header in the BIOS. You can try to adjust it with speedfan, but not all motherboards have the ability to vary voltage to the fan headers on them. If speedfan will not control the fan speed, your only choice is to replace the fan with a PWM fan, and chain it to the PWM control of the CPU fan header, install a manual fan speed control, or as xd_1771 suggested, install resistor wires to slow the existing fans down, or replace them with quieter fans.
Oh poop. I didn't understand any of that... frown.gif

So basically, there's no easy way to do it with this motherboard, huh? I'll have to either go out and get a better fan, or use a workaround? Darnit...

Well anyways, thank you everyone!
 
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