These fans are very quiet! They've replaced some Apeva brushless fans that have seen better days with some Halos kits to make them heavier, further dampen noise, and add lighting. My build went from the sound of a jet engine to the fact I forgot it was in my office! There are 9 of them in one case (push-pull liquid cooler, front panel and back panel) and I don't even notice them here. The airflow speed/pressure is consistent with what you see on the Noctua. Wonderful. It's been 3 months since purchase and STILL a whisper. No noise/hum after 3 months of continuous use. Still sounds like they come fresh out of their boxes and do exactly the same thing!
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