I put all five pieces in the Fractal design define c case - 1 for blowing, 3 for blowing on the front panel and one for blowing the video card from the bottom of the case. Everything works silently, only in hard stress tests at high (1400+) rpm it becomes audible. Has some pros At this price, 5 fans of this quality at once are just for nothing. I must say that these are the ones on the top-end dropsy from Arctic - Liquid Freezer 2. Accordingly, the air flow is excellent, the sound characteristics are excellent. They are definitely no worse than Noctua, but the cost is just 3 times cheaper. A separate plus is that they can be powered from one connector on the motherboard right out of the box. They are connected in parallel to each other. Its cons: At maximum speed, of course, a little (precisely a little) is audible. Still 1800 rpm. But on average, up to 1100 - complete silence.
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