Two fans blowing at each other...

[tezt]

Hi everyone !

I go problem with my fans. I'm running following configuration where front CPU fan pulls the air, and second CPU fan pushes it out.

It generates a pitched/whistling noise.
Initially I was blaming my video card, then PSU, then actual heatsink but it turnout that CPU push out fan is blowing air on my case fan which generates that noise.

Has anyone had that issue ?
The case is cooler master storm stryker.

 

[mickypheonix]

Hi tezt
if you put your hand between the pull fan and the case fan does the noise stop ? or is it an individual fan making that noise ?

 

[i7Baby]

Try a coolermaster hyper 212 evo - $30 and good reviews

Or try different fans. Or try different fan speeds.

 

[Karadjgne]

Change your CPU fan speed to a lower rpm, or increase exhaust fan speed. You have a need for the fan to overcome the lack of suction created by the higher static pressure of the CPU exhaust fan.

 

[tezt]

Hi tezt
if you put your hand between the pull fan and the case fan does the noise stop ? or is it an individual fan making that noise ?

I did what you suggested and no, the noise is still there.
I also tried to enable/disable each of the fans and it turns out that the push fan is making this noise on it's own but not as loud as when two of them are running together(push and pull).

I tried to record the sound it makes but you can't really hear it as it is barely noticeable.

It is only noticeable when fan's are spinning at 1100-1300 RPM with 1800 MAX.

Unfortunately, there is no way I could limit RPM on my back fan as two of them are connected to the motherboard through splitter (motherboard has only one CPU_FAN connector).

 

[mickypheonix]

ah i figured as much , i would suggest buying a new set of static pressure ( SP fans ) for the cpu heatsink , i am asuming they are 120mm
corsair make 120mm sp fans , like these
http://www.pccasegear.com/index.php?main_page=product_info&cPath=9_510&products_id=23713

 

[Karadjgne]

How old are the fans? Look pretty new (or at least well cared for). You may be under some kind of warranty still. I'd contact the place you bought the cooler from, or Phanteks at least, you may be entitled to an RMA replacement.