Originally Posted by Corsair Joseph
I'll be more than happy to get those fans back from you guys for FA (failure analysis) here in HQ. That way we can figure out if these are just bad units right off the bat, or something else. Please submit an RMA request and send me a PM with your ticket # so I can provide you guys pre-paid labels to cover shipping fees.@sdch
You mentioned that you used PWM to control the fans, I'd assume that's through your BIOS mobo? Where are you getting the RPM readings?
The reason why I'm asking is because you said 30-35% is around 750-850 RPM when these fans should run around 500 rpm at 40%. I just want to make sure that you're getting accurate reading.
Sorry for the late reply, I'm already going through the return process (purchased from Corsair directly).
I'm pretty sure about the fan speed. I already took the fans out of my case, but here's an example of one I pulled back out of a box at random just now.
35% in bios:
~740 RPM in bios:
~740 RPM in HWMonitor:
The oscillating sound is only in the vertical orientation:
Not when positioned horizontally:
It's much worse when you add a bit of impedance to the fan by holding a radiator to it, or even a book or your hand for a quick test. The worst offender was the pull fan in a push/pull configuration on an h55 radiator for my gpu. Testing the RPMs of the push and pull fans showed a difference of less than 50 RPM with the pull fan being slightly slower. It sounded like someone whistling softly in a modulated kind of way.
Anyway, I hope you guys identify the issue, and I included some of these notes in the RMA ticket.