I got 4 pieces. Three to replace the original exhaust fans that came with my Antec P280 case 7 or 8 years ago and 1 to bring in fresh air from the front. Older fans were just 3-pin fans with a high/low speed switch mounted on the back of the case. These are of course 4-pin PWM fans controlled by the motherboard. These fans are silent. I can hear the Cryorig H7 CPU fan when it starts overclocking, but I can't hear the 4 Noctua case fans. The case and everything that works in it is cooled. My I7-6700K, not overclocked, dropped from idle at around 32C to idle at around 28C. Running Aida64 it dropped from a peak of around 72 seconds to 63 seconds. Oh, and did I mention they're silent? :-) I will definitely buy (and probably buy) them again. Actually, I'm preparing to do a new build with a Ryzen 7 3800x and a new x570 motherboard in that case next weekend, and I've ordered a Noctua NH-U12A CPU cooler for it. I can wholeheartedly recommend these fans.
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