When you run them at 400 rpm the wind noise is very quiet, well silent really. When you get to about a foot away you can hear motor clicking, which I didn't expect.
Comparing them to the silent wings, the wind noise at 400 is inaudible on the silent wings and very very slight on the corsair. The clicking however is quieter on the Corsair.
The Corsair moves a hell of a lot more air than the silent wings. I'm actually getting better temps from one Corsair compared to two of the SW2.
When you ramp them up, they do get loud and the ticking is far more obviouse. My god to they shift air at full tilt though.
It's worth mentioning that I can't get them to switch off like the SW2.
I have decided to RMA the SW2 and order another Corsair.