Summary: This thing is SILENT! I was a bit skeptical when I bought it. I already had fans that work fine, I just wanted something quieter. This moves more than enough air, and is about as quiet as physically possible!
Summary: I needed a 120mm fan of the strong, silent type for my project. This Noctua is a stealthy little turbine. Throttled back to just seven volts it is inaudible from a foot away, yet can still move enough air to safely maintain lukewarm temps for 150 watts of cool-tubed, darkroom vented, high pressure sodium goodness. Two of these stacked in tandem would be a ventilating ninja. SCIENCE !!!
Summary: Other than their color, these fans are excellent buys. They generate vry little motor noise, all one hears is the rush of air. The leads are generous and I'd like them a bit shorter. Good warranty and company support. In all I now have and use 10 Noctua fans in 3 machines and will have 4 more in a new build.
Summary: Relatively silent, but not as silent as the previous 120mm 1500rpm's gen which I also have. Still a good fan but make sure you pricematch them ($42 almost seems like a site error). Not as impressed with these as I was with the previous gen, pick up the others if you can.
Pros: -Relatively silent, -Much cheaper on pm, -Noctua is still the best silent fan on the market despite its flaws
Cons: -All 3 I bought seem to have the bearings and/or fan rotation making slight mosquito noise from them, can't hear it unless you're really close though, but could be a problem if you're close to your case., -The grate over the front of the fan is much thicker than the previous 120mm gen. Despite the grates streamlining it's still too thick and creates unecessary resistance (the last gen had thinner grate), -Obviously expensive
Summary: IT'S ACTUALLY 52CFM and they use a misleading metric no one else uses, kind of scummy for such a quality product. But this thing is SILENT. I had similarly powerful fans on my cpu and they were loud! These are amazing replacements for my heatsink's stock fans. I absolutely love these fans and will be buying more for the rest of my case eventually.
Summary: Expensive... but it comes with ALL the bells and whistles. You get an extension cord, a cord for low rpm, a y-splitter, rubber pads everywhere. Also it's quiet. Replaced the Cooler Master fan that comes in a Hyper212 which was already not noisy. I barely notice my computer is on under my desk. Also this matched airflow (temperature measured) with the CM fan at the lower RPM, so no need for more noise!