Noisy fan

  • Thread starter Thread starter Stu Wilson
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Stu Wilson

I had posted here previously. This is a follow up. I got a new Panaflo
fan today. It sounds the same as the first one. You can't hear any noise
when fan is not connected to case unless you put your ear very close. Then
you hear a very suttle knocking noise. When the fan is attached, it has this
same noise, but louder. I can hear it two feet away with the case on. Not
real loud, but definitely noticeable. I could near this same noise if I just
set the fan on the case floor, unattached.
 
I had posted here previously. This is a follow up. I got a new Panaflo
fan today. It sounds the same as the first one. You can't hear any noise
when fan is not connected to case unless you put your ear very close. Then
you hear a very suttle knocking noise. When the fan is attached, it has this
same noise, but louder. I can hear it two feet away with the case on. Not
real loud, but definitely noticeable. I could near this same noise if I just
set the fan on the case floor, unattached.
Click to expand...


I've not noticed anything other than a steady consistent sound
from Panaflos, in free air or installed. Are you always hooking
it up to same fan power pin-header? I'm wondering if the
motherboard varies the fan RPM, either intentionally as a
thermal-throttling response, or due to poor 12V circuit it drops
when CPU is at peak power utilization, or your system power
supply is performing very poorly?

All I can suggest is to check those things and if nothing else
seems wrong, try a differnt make of fan... though for my uses
Panaflos worked very well and many people use them without any
mention of this knocking noise you report.
 
kony said:
I've not noticed anything other than a steady consistent sound
from Panaflos, in free air or installed. Are you always hooking
it up to same fan power pin-header? I'm wondering if the
motherboard varies the fan RPM, either intentionally as a
thermal-throttling response, or due to poor 12V circuit it drops
when CPU is at peak power utilization, or your system power
supply is performing very poorly?

All I can suggest is to check those things and if nothing else
seems wrong, try a differnt make of fan... though for my uses
Panaflos worked very well and many people use them without any
mention of this knocking noise you report.
Click to expand...

I was told by the vendor that the fans are designed to vary the speed
depending on the temperature in the case. Is that what you mean?
 
I was told by the vendor that the fans are designed to vary the speed
depending on the temperature in the case. Is that what you mean?
Click to expand...

Yes, that could be the problem, assuming you mean that the fans
themselves were single-speed parts that had speed varied by case,
motherboard, or power supply intervention.
 
Stu Wilson said:
I had posted here previously. This is a follow up. I got a new Panaflo
fan today. It sounds the same as the first one. You can't hear any noise
when fan is not connected to case unless you put your ear very close. Then
you hear a very suttle knocking noise. When the fan is attached, it has this
same noise, but louder. I can hear it two feet away with the case on. Not
real loud, but definitely noticeable. I could near this same noise if I just
set the fan on the case floor, unattached.
Click to expand...

Sounds like you have loose parts on your case. Is the fan screwed into place
or mounted in a clip on box?

Have you tried mounting the fan using rubber washers between the case and
fan?
 
kony said:
Yes, that could be the problem, assuming you mean that the fans
themselves were single-speed parts that had speed varied by case,
motherboard, or power supply intervention.
Click to expand...
The fan that came with the computer is a Sonicedge
http://www.chassishq.com/hardware/partinfo-id-33483.html
It is a bit quieter than the Panaflo I tried. Is there a fan that is
specifically for a computer that has speed varied by motherboard, etc. that
might be quieter?
 
Noozer said:
Sounds like you have loose parts on your case. Is the fan screwed into place
or mounted in a clip on box?

Have you tried mounting the fan using rubber washers between the case and
fan?
Click to expand...
The fan is screwed into place. I have not tried rubber washers. I could
look for some and try that.
 
The fan that came with the computer is a Sonicedge
http://www.chassishq.com/hardware/partinfo-id-33483.html
It is a bit quieter than the Panaflo I tried. Is there a fan that is
specifically for a computer that has speed varied by motherboard, etc. that
might be quieter?
Click to expand...


I don't have any other suggestions that I'm confident would work
with your setup... I would try a Sunon lowest-RPM model and/or
putting a 68 ohm 2W resistor in series on your Sonicedge's power
lead, but sometimes trial and error is needed to find optimal
result with a variable fan control feature, I can't be sure they
will provide desired result either.
 
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