I was looking to get the best low-noise but high performance fan for the single output of my case to balance with the 4 low-noise fans I had running for air intake. Originally I had Fractal Design Dynamic GP14 fan that came with the case but I swapped that to be an additional input when I upgraded to a higher powered Corsair ML140 Pro. With the Corsair fan performance was decent but I found it seemed to get a bit noisy at moderate speeds.Realistically, my cooling setup was always more than adequate, I didn't have any temperature issues whatsoever, but I am a bit of a nerd for good air cooling and just like upgrading something once in a while and it seemed like there was room for improvement here.I had the corsair for several years but I would occasionally do research on fans or watch the latest reviews and comparisons of fans on youtube. Eventually the time felt right that I felt like spending the money and that there were some good options to upgrade to. This fan has been a definite improvement capable of moving more air at lower sound levels. I also like that it has the headroom to push to even higher speeds than I need with my current setup just in case I ever feel like it or was trying to max my performance having fun overclocking and benchmarking. I didn't bother to do any recorded tests of my temps but my subjective experience has been that I am very happy with the performance as I created a fan curve for it that gives me what I want airflow wise and my computer remains quieter than it did before. I also stepped away from having my computer with so many LED lights so the transition to a fan without lights worked for me. A few months ago I made significant upgrades to my processor and my video card and this still handles everything I can throw at it with ease and quietness. I have been super happy with the performance of this fan and will definitely have them in mind next time I am building a system.

I have DeepCool AK620 Digital WH that has two 120mm (1800rpm) not-bad coolers, but I felt like they were not sufficient headroom for 9800x3d and were quite noisy.So switched both fans for be quiet! Silent Wings 4 and it's just great now. Nice looking, silent, and has plenty of power (3000rpm) just in case.

Got one of these to replace the exhaust fan on my case, for some increased airflow. Also because its white and matches the case. I got a very premium feeling fan, which came in its own box inside the outer box. Some screws, push pins, and alternate fan corners to use fan screws instead of the push pins. The fan cable came wrapped around the frame perfectly as well.I opted for the push pin installation because they seem more unique than regular screws. Installation only took about one minute thanks to them! Before I installed it in the case, I compared the noise and airflow to a Noctua A14x25 with the scientific instruments of my ears and hands. At full speed, the Noctua fan produced some motor noise, but provided a more focused airflow out the back of the fan. The be quiet! fan had no motor noise whatsoever, while spinning 500 rpm faster, with only the sound of air moving being evident. However the be quiet! fan had a less focused exhaust than the Noctua, though it is advertised as having a funnel shaped outlet so maybe this is intended. Will definitely buy more of these if I end up needing more 140mm fans.edit: i bought another one lol

Let me just start by saying, these fans are GORGEOUS. Seriously, these are the best looking fans on the market by far and no other fan comes close. These just look so premium and expensive. They feel it too. These things are HEFTY for a PC fan. They just feel so solid and well built and genuinely feel like a product that's made to last.The cable these fans have is also just so unnecessarily nice. Yo, they for real SLEEVED the cable and gave it a plastic connector with the Be quiet logo on it. What?! Ain't no one EVER gonna see/feel that cable or the nice connector. But they did it anyways so the moment you install these for the first time you feel like you TRULY got your moneys worth. This is the sort of attention to detail you want from a high-end product!Alright, onto performance and noise levels.I've compared these fans to the Phanteks T30's, Noctua A12x25's, and the Corsair AF120 RGB Elites. These were the only fans I had lying around for testing. These blow the Corsair's so far out of the water I won't even spend time comparing the SWP4 to the Corsairs. Total knockout, three fold. These are better than the Noctua's. They spin much faster and sound quieter to my ears. No professional measuring equipment here, but these are damn nearly silent until about 1,600 RPM. The Phanteks are the better performers, but not by much. This is a given because they are 30mm thick versus 25mm on the SWP4. However, I only noticed a degree difference in GPU temps between the two. However, the SWP4 were quieter. Let's also not forget that the SWP4, being the slightly thinner fan versus the Phanteks, will have better compatibility with longer GPU's and smaller cases. I will gladly take a degree difference for a quieter fan that has slightly better overall compatibility.I love these fans so much that I ended up populating my entire system with them. They are truly worth the price simply because of the performance, build quality, noise levels, presentation, attention to detail, and nice additional accessories. For users looking for the 'One Fan to Rule Them All' fan, these are it.

pretty expensive but amazing quality fan with a braided cabled and it's extremely quiet, the noise it does make at higher rpm is a very low frequency sound so it isn't a problem even at high rpm

Had some cheap fans in the front of my machine. Very loud when ramping up.Purchased 3 of these. Changed Bios over to PWM. Only change I did.For me, its a night and day difference. My PC/fans are located 30" me (level to my from my ears.) I can now hear my TV 25 ft away. These fans are kinda pricey, however, I am NOT disappointed!These ARE Quiet. ( ͡❛ ͜ʖ ͡❛)👍

Bueno y barato

Está increíble. Tiene excelentes velocidades y no hace ni un poco de ruido. Totalmente silencioso incluso a su máxima capacidad. Recomendado totalmente. Ojalá haya en el futuro uno de la misma marca disponible en 80mm

Excellent fan! Reasonable price for a decent silent fan. I've had better ones in the past from Antec but they are no longer made so this was the closest thing. They still make a bit of vibration but overall they are perfect.

Llevo ya 1 mes y vengo posponiendo esto desde hace un tiempo, asi que vamos alla:1.- El producto llego a tiempo a pesar de que vino desde muy muy lejos.2.- La caja llego completamente sellada y en perfectas condiciones.3.- Los ventiladores estan en buenas condiciones, con todos sus componentes y sin ninguna rayadura. De hecho estan tan bien selladas que me llevo tiempo abrir la maldita caja y sacar las piezas hahaha4.- Me encanto el producto, es bastante robusto, solido, pesado y de un material de gama alta. Be Quiet! siempre supera mis expectativas.5.- Bien, decidi actualizar mis ventiladores por que el que tenia de stock (el frontal) le rompi una aspa mientras lo limpiaba, ademas que ya empezaban a hacer ruido y era molesto.6.- La instalacion fue simple, ya contaba con el Dark Rock Pro, asi que estos le quedaron como anillo al dedo, puesto que uno va en la parte frontal del disipador y el otro justamente atras para mantener la temperatura lo mas estable posible.7.- Los adaptadores fueron muy utiles, le quite los que tenia por defecto y los atornille sin problemas.8.- Mejoraron el rendimiento? Pues si y no, el Enfriador Dark Rock Pro ya me deja a los 70/72 grados estables al maximo rendimiento, la mayor diferencia es cuando trabaja de forma normal, justo ahora estoy a 27 grados, dentro del gabinete esta a unos 34/36 grados promedio. Y de ahi no supera los 42 o 45 grados. En condiciones ambientales diferentes la temperatura cambia entre 7 y 10 grados (min/max). Y realmente no parece mucho hasta que comparas las revoluciones por minuto a los que trabaja (rpm). Basicamente, aunque los compre para que trabajaran en condiciones muy criticas y le sacara esos 2500 rpm (renderizacion/videojuegos), la temperatura nunca superara los 72~75 grados. Lo ridiculo es que mantiene esa temperatura trabajando apenas a la mitad de su capacidad, simplemente no supera los 1700 rpm. Ni siquiera el Dark Rock Pro que antes trabajaba a 1200rpm, ahora anda comodamente a unos 700~800 rpm. max. Y eso solo con 2 ventiladores frontales y uno trasero. Estoy ampliamente satisfecho. Definitivamente seguire actualizando mi computadora para agregarle mas ventiladores.9.- EDIT: Casi lo olvido, cuando ajuste el rendimiento de los ventiladores desde el software, son muy silenciosos, Be Quiet! vive de su reputacion.10.- Tomen en cuenta que el modelo de 120mm esta diseñado para empujar el aire con mayor fuerza, si quieren mayor flujo de aire pero con menor presion, usen el modelo de 140mm, que va a 2500 rpm. Esto es un factor a considerar dependiendo de la posicion en la que instalen sus ventiladores. En mi caso, me interesa mucho que presione el aire con fuerza directamente en frente del disipador (Dark Rock Pro) y de la misma forma, saque el aire con fuerza. Asi evito que se acumule el polvo. Pero cuando se tiene una tarjeta grafica, conviene mayor flujo de aire instalando unos ventiladores de 140mm en los laterales.

Jamais vu un ventilateur aussi silencieux, cependant le câble est presque trop court... A ce prix on aurait aimé un plus long câble ou une rallonge