ARCTIC S4028-15K (5 Pack) - 40x40x28 mm Fan, 1400-15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC - Black

No frills, no marketing bs, just pure performance. I needed good 40mm PWMs to cool my optane rams and these were perfect. I would have gotten the normal AVC used in servers but they're too loud. The 11k RPM version of this would work just as well and is also quiet compared to the AVC but it was not needed for this use case. The rams were hitting 70c prior without proper airflow. They peak at 43c with these fans mounted on top.

Replaced a stock fan in a supermicro 1u server. Max rpm are 2000 less than the stock , but pushes about the same air at 50% and doesn't have the tinittus ring the stock fan has. Will buy more

Worked perfectFor what i needed

Bought this and placed it on top of my M.2 Samsung heat sink with Velcro,little thing can go up to more than 3000 rpm!So far it does its work at keeping things cool. Purchased on Nov 2023 and its still kicking .PS: A bit more than 1 inch in height with the Velcro pads.

Very powerful fan moves a lot a air well just a little loud other than that if you need to move airflow (cooling well) probably one of the best out there!

I bought this backup one incase the original one I have fails, which has been running 12 to 16 hrs. / day for a year, with no problems yet.

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 🔥