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chassis fans and fan controller

Tags:
  • Power Supplies
  • Computers
  • Fan
  • Components
  • Fan Controller
Last response: in Components
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April 7, 2014 10:16:59 AM

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?

More about : chassis fans fan controller

a b ) Power supply
April 7, 2014 10:29:11 AM

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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April 7, 2014 10:48:18 AM

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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a b ) Power supply
April 8, 2014 2:18:58 PM

it wont do the fans any harm but it sounds like the motherboard is limited to support rpm system fans only.
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April 9, 2014 12:25:47 AM

Ok. The motherboard is asus m5a97 evo r2.0. If I remember correctly I would say the motherboard has 4-pin connectors for the fans.
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a b ) Power supply
April 9, 2014 1:39:58 AM

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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April 9, 2014 5:06:21 AM

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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a b ) Power supply
April 9, 2014 7:37:20 AM

they will run at there max speed unless your fan controller handles rpm rather than pwm.
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April 9, 2014 7:46:44 AM

Ok.thanks for the answers.So there's no need to do anything about it?
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Best solution

a b ) Power supply
April 9, 2014 10:49:33 AM

theres no need as its just the app your using is reading the wrong info. the fans will work fine regardless.
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April 9, 2014 12:03:36 PM

Good to know.thanks for the answer
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