That's a Noctua fan! "He usually says everything. 1500rpm seems to be more popular, I don't really understand why, but I took 1200rpm because I wanted quiet. I will never run these things at maximum speed. I don't know how people say these things are "quiet" at full speed - maybe the fan itself is there, but the air turbulence it creates isn't. It's not the fans fault, it's just the physics. I connected 3 of these to a PWM hub and at 50% speed they are really quiet. Most people couldn't tell what the PC was at first when they walked into my computer room. They're still good at 750 rpm, but I'm glad I bought this 1200 so I can get a lot less. If you're chasing this "Silent" only fair warning: dark to give you better "night vision". The same happens with your ears. So yes, in the middle of the night you will probably hear airflow, but I find the sound it makes much nicer than other fans. You will also likely hear other components in your PC that your fan noise drowns out the fan noise of your PSU or hard drive. This is going to be a fight you can't win. All this to say that I cannot recommend them highly enough! They let a lot of air through even at low revs and are quiet. The only negative thing I can say about them is that their cables are a few inches shorter than my old fans. This can be a problem in some cases, but on my Define R4 with a PWM hub plugged in next to the 5.25" drive bay, all the cables for the two front fans and one rear fan easily sufficed. EDIT: I would also like to confirm something that isn't actually listed anywhere. The starting voltage for this fan is just under 5V in case you need to use voltage speed control for some reason.
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