ARCTICS4028-15K - 40x40x28 mm Server Fan, 1400–15000 RPM, PWM Regulated, 4-pin Connector, 12 V DC, Rack Cooling Fan - 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.

These are amazing 40mm fans, and move a ton of air. I use them to cool several Tesla P40 GPUs with custom 3D printed shrouds and 2 fans per card, and they do an amazing job keeping them cool under load.They are loud, but at 50% speed the noise isn't too bad and they still cool really well. Probably could've went with the 6K model but I wasn't sure what temps I would get so wanted the extra overhead just in case, and knew I could run these at lower speeds anyways. Given the small price difference you might as well get the 15Ks and run them lower.Overall these were a great buy.

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!

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.

Purchased these for a 3d printer chamber filter (customized Bentobox air filter) and used them with a speed control I also got from Amason and everything worked well. Noise isn't bad especially when you turn the speed down. - speed controler = https://www.amazon.com/dp/B0BHNC776L?ref=ppx_yo2ov_dt_b_product_details&th=1

its a bit loud, whines.. but good air flow for tiny fan, use it on my bit-axe solo-miner...had to manually adjust speed very low keeps it 44C with 52pi heatsink and a noctua fan on the other side.

Originally was using another pair of 40x40x28mm fan that came with my In-Win 1U case. Was running at max speed since it was 3 pin. Bought a couple of these Arctic fans since they were 4 pin and have been working out great. Have them running at approximately 6-7,000 RPM and they are decently quiet for behind a closed door. It’s nice to have the ability to go back up to 15,000 RPM if necessary but I think the temps will be fine running at ~60% speed. Screws fit fine with the pre-existing screws from my old fans, but be careful screwing everything back on. I accidentally cracked a corner of one of these Arctic screws but obviously it’s still fine.

Worked perfectFor what i needed