I love these fans. I replaced a factory exhaust fan from my case and two fans from my AIO cooler in a "pull" configuration. Thanks to the fin design, they also work great in "push" mode. My CPU temperature dropped by an average of about 7 degrees and noise levels dropped significantly. I have a computer on the table next to me and I can't hear the fans when I'm playing games. Since they are 4-pin PWM, they idle at 600-700 rpm. Even at full load (1200 rpm) they sound very quiet. Not entirely inaudible, more like a slow, low-frequency drone. Of course, it all depends on your case, processor, etc. Personally, I prefer the dark gray and light gray combo over Noctua's brown colorway.
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