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The fans on my Dark Rock 4 I don't hear at all. The other two in the case I don't hear at all. The one that this was intended to replace was about the same volume, it's just that its noise was more of a grindy rattle of cheap bearings. They are admittedly flimsier and lack rubberized mounts, but I'd still be better off playing the fan lottery for particularly quiet ones than one of these. I don't have the tools to scientifically measure it, but most of my cheapo 120mm Cooler Master generic case fans that came in a 4 pack for about the same price as this one are quieter, and it feels like they move just as much air. Overall Review: Very disappointed in this "ultra-quiet" "premium" fan. Before this, the only noise I heard at idle was the whirring of HDDs. Very disappointed in this "ultra-quiet" "premium" fan. BRB unplugging, it's going to drive me insane if I listen for any longer. Horribly distracting and never fades into the background. It comes with two Pure Wings 2 140mm fans, one configured as front intake behind a steel panel and foam layer, and one as rear exhaust. Look nice.Ĭons: This thing makes an EXTREMELY noticeable whine/hum that ramps up and down with the speed. Buy be quiet Dark Rock 4 CPU Cooler with Silent Wings, 200W TDP, High Performance - Silent Wings 135mm PWM LGA 1700 Compatible with fast shipping and top-rated customer service. The mounting system is extremely fast and easy.