Question Weird noise made by the FC120 fans on DeepCool LS720 WH CPU Cooler ?

[askaroth]

Hey everyone!

I have some noise issues with DeepCool LS720 WH fans. I know that they're loud in general, but I keep hearing really annoying, irregular buzzy noises peaking at around 850RPM, and whistling/whining sound being the loudest at around 1450RPM. Well, weird symphony in general. Every of 3 fans emits this kind of noises at some point.

I contacted DeepCool support and they sent me 3 new fans, but the story was the same with the new ones.

The noise sounds really similarly to this, but sometimes is very loud (can even hear it from another room when the load is like 40%):

View: https://youtu.be/i3Qs07Qgdjw?feature=shared


Has anyone of you experienced something similar? Obviously I adjusted the fans curve to avoid the most noisy RPM ranges, but it's still annoying at some point and disappointing for this product to hear these noises.

I thought of buying other fans for this cooler, what do you think about Corsair AF120 Elite (white RGB version to match the aesthetics)? I heard that they are really high-quality and quiet fans for radiators, and they don't seem extremely expensive.

 

[helpstar]

are you sure it´s the fans and not the pump?

 

[askaroth]

are you sure it´s the fans and not the pump?

100% sure, the sound stops immediately when I force the fans to stop, also the noise gets louder on specific fans' RPM areas

 

[pcbuild332]

Same here with LS520 AIO fans. Just bought one and got these "resonance" noises straight away. LS520 includes two FC120 ARGB fans. They produce resonance noise at specific RPM speeds. Noise sound ranges from deep low frequency humming to higher pitch singing bowl type of sound depending on the RPM.
I was changing the speed of CPU fans in the motherboard software. The sound changes or disappears depending on the RPM. When fans are stopped while other PC fans are still working, the resonance noise goes away.
Both lower pitch hum and singing bowl high pitch noises can be heard from another room and are very annoying

 

[askaroth]

Same here with LS520 AIO fans. Just bought one and got these "resonance" noises straight away. LS520 includes two FC120 ARGB fans. They produce resonance noise at specific RPM speeds. Noise sound ranges from deep low frequency humming to higher pitch singing bowl type of sound depending on the RPM.
I was changing the speed of CPU fans in the motherboard software. The sound changes or disappears depending on the RPM. When fans are stopped while other PC fans are still working, the resonance noise goes away.
Both lower pitch hum and singing bowl high pitch noises can be heard from another room and are very annoying

Good to hear that I was not alone. I have just replaced all of them with Cooler Master Mobius 120P and they are amazing - no resonance or humming at all, much more quiet than DeepCool ones, very pleasing sound