chassis fans and fan controller

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chripun

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Apr 5, 2014
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So I have a zalman z3 plus computer case. It has 4 chassis fans (3 of them has a 3 pin connector and the back fan goes to the power supply).
Currently I have the front fan connected to the motherboard and the two top fans connected to the fan controller connectors that came with the case and the back fan to the power supply.
So about every other time when I start up the computer both hwmonitor and asus ai suite shows the front fan spinning at about 900-1000 rpm, which seem normal to me. But the other times it's 337500 and 675000 rpm. Jumps between those two numbers, nothing in between. So what goes on there?
The other question is: does it matter which fans I have connected to the fan controller?
 
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HEXiT

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Mar 13, 2011
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3 pin fans are rpm fans the 4 pin is pwm. its likely you have the fan controller on the motherboard set to pwm rather than rpm in bios. switch it over and you should get the correct rpm reading. if you have the option of auto give that a try if its not already enabled.
 
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chripun

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Apr 5, 2014
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The only options I find in bios for the chassis fan is cha q-fan control (ENABLE and disable), cha fan speed low limit set to 600 rpm, chassis fan profile (STANDARD, silent, turbo, manual).
Bios showed the fan on 9820 rpm and sometimes briefly jumping to 19640rpm and the back again.
 
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Deuce65

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Oct 16, 2013
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Asus motherboards in general only support voltage control for the system fans, not PWM. The CPU header is PWM, the others are not. I know they have four pins but they are not PWM, the fourth pin doesn't do anything.
 
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chripun

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Apr 5, 2014
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Thanks for clearing that up.
But are the fans actually spinning at their normal speed all the time even when it sometimes shows they're spinning at 675000 rpm?
I always guessed it's just a misreading.
 
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