Noctua NF-A6x25 PWM, Premium Quiet Fan, 4-Pin (60mm, Brown)

When only the quietest and best flowing fans are good enough for your personal rig, buy Noctua. Faster than expected shipping too!

Working well with minimum noise

You get what you pay for wih these fans. Super quiet and with good air flow. Recommended if you can justify the cost

I use two NF-A6x25 PWM on my DELL T5810 to help cool the internal. I initially use 4 pin to 5 pin adapter and connect the two FAN to the HDD fan header but it turn out the speed is too slow to be useful. I end up buying SATA power to two 4 pin fan adapter (this will make the fan run at full RPM as it connect only the two power pin @ 12v) so I use the Low noise adapter cable supplied included in the noctua fan to make the fan run at lower RPM instead of full RPM. My setup is one fan at the back for exhaust and another one in-front of the CPU to push more fresh air into the CPU. My CPU temperature is 3-5c cooler, for light work (browsing / watching youtube will be 35c-40c) with room temperature of 28c. The two noctua fan are practically silent and I didn't notice any noise increase by installing them.

I bought the Noctua NF-A6x25 PWM for one very specific job: dedicated cooling for the SAS HBA controller in my DIY NAS. And honestly, it's almost perfect for the job. HBA cards can run surprisingly hot, especially when they're installed in a converted desktop case rather than a server chassis with huge amounts of forced airflow. Instead of hoping the general case airflow would be enough, I wanted a small fan blowing directly across the HBA heatsink. Enter this little 60 mm Noctua. Don't let the size fool you. It moves a very respectable amount of air for such a small fan, and directing that airflow exactly where it's needed makes a huge difference. My HBA now gets its own dedicated stream of cool air while the NAS runs 24/7. The PWM control is excellent, so there's no need to run it flat out all the time. Set a sensible fan curve and it remains remarkably unobtrusive while still providing plenty of cooling. Build quality is exactly what you'd expect from Noctua. Everything feels beautifully engineered, the motor is smooth, vibration is minimal, and the included accessories make installation easy even when you're doing something slightly unconventional. And yes... it's brown. 😄 No RGB, no disco show, no attempt to look like something from a spaceship. It's unmistakably Noctua. You either understand the brown or you haven't owned enough Noctua fans yet. Is it cheap for a 60 mm fan? No. Do I care after seeing how well it performs? Also no. For cooling HBAs, RAID controllers, networking cards, compact servers, NAS builds or any other hot component in a tight space, the NF-A6x25 PWM is a fantastic little problem solver. Five stars — tiny, quiet, beautifully engineered and surprisingly capable. My HBA can finally chill out. Literally. 😄

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