ARCTIC S4028-6K (5 Pack) - 40x40x28 mm Fan, 250-6000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

El performance de los ventiladores es muy bueno definitivamente cumplen con su función, tanto para servidores, NAS o para agregar un extra de ventilación a los headsync de la tarjeta madre funcionan a la perfección, el flujo de aire es bastante bueno y con bajo nivel de ruido. en comparación con la competencia NcTua, creo que valen cada peso de lo que cuesta el paquete de 5 es excelente y son PWM

I have bought multiple packs of the 6K and used them all over. Imo I would say the difference in noise between these and a Noctua is fairly neglible so don't believe those that say these are insanely loud. I may be biased because I am replacing MUCH louder fans in old server equipment so anything quieter is a blessing, however I have tested the Noctua and the 6K version side by side in a quiet computer room of mine and even being next to them on full blast these were barely audible. I hooked them up to a bench top power supply giving 12V DC so there was no confusion of if they were each on full blast or if the noise was being muddied by other fans. I think the Noctua is a better pick if you absolutely value complete silence above all and you intend to use these in a computer that you have tuned to full blast. Otherwise with PWM I would pick these 100% of the time - they're much cheaper AND they move MUCH more air than the Noctuas, which is another great benefit in old server components -- I need the airflow. Ultimately these are a great buy and I would definitely recommend them!

I got the Jonsbo TK-1 v2 case, but there weren't a lot of rooms for larger 120-140 fans. BUT THESE BAD BOYS CAME IN CLUTCH. There's some ventilation space on the left side of the case that I suspected these could fit in, AND THEY DID! Helped reduced my temp by quite a lot, I can feel them pumping out air as I ramp up performance and they do AN AMAZING job. The YouTube videos on them were rare albeit high quality and that's why I decided to stick with them instead of competitors. Running 4090 and 7950X3D and mewmaxxing on ultra + high every settings on Baldur's Gate 3 and Dota 2, but temps after were fantastical. Obviously water-cooling is a component here, but these fans did WORK to keep the internal of my chamber breezy. Will be buying more and stocking up for future builds. 10/10 🔥

Original fans on the Ubiquiti US-48-500W had a lot of coil whine. Switched them out for these. Coil whine gone and probably cooler with the top on whenever I cut some of the back out to fit the aftermarket PSUs since the original PSU was dead when I got it. Took all of 5 minutes to switch it out.

Fit my Supermicro 1U case brackets nicely. Very quiet compared to OEM fans.