Nanoxia Deep Silence 140mm 1800rpm Fan Cooling, NDS140-1800
- Up to 1800 RPM for 12V cable and 1100 RPM for 7V cable
- Noise level of 21 dBA for 12V cable and 12 dBA for 7V cable
- 98 CFM Airflow for 12V cable and 65 CFM for 7V cable
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Most helpful customer reviews on Amazon.com
What did that leave me with? A list of all fans that were the best bang for the buck as far as noise generated from air movement. Nanoxia Deep Silence fans were FAR AND AWAY the best on that list. For the money, these are simply the best fans you can buy if you're wanting to move a decent amount of air and keep your noise levels down.
I mean, the blades are dark green, semitranslucent, and incompatible with most build themes. The low noise adapters have white connectors and are not sleeved (but will likely be tucked behind the MB tray in your cable management area). So if you're building a sleek, sexy tempered glass show rig, these might not be for you.
If, however, you're hardly ever going to look at them, and prefer a clean, dark, impermeable sort of case (think Fractal), you won't find a better balance of airflow and acoustics. I don't know if they produce enough static pressure to penetrate a radiator, but they produce enough to create damned fine airflow in an intake-restrictive case. Good enough airflow, even with the low noise adapters (7V constant), that my 95W i5-2500 is being cooled by a NoFan CR-80EH (completely passive!) cooler inside a Fractal Design Define Mini C without ever getting over 72C under a substantial BOINC crowd-computing load for over 5 hours! And they do that in dead silence. No, really. Dead silence! I can hear the hum from my speakers (already quietened by ground loop noise isolators!), but not these fans (@ 7V).
Despite the noise, I installed both of them (and making note which one made the noise in case I needed to remove it). After starting the PC, the 2nd fan kept making this odd "metal scraping" noise, but it wasn't very loud. I decided to leave it in running for a few hours, and when I went back into my home office, the 2nd fan's noise had increased from the low scraping sound to a louder ticking noise. So without a doubt, and like several other reviewers on here have reported, the fan bearing was bad out of the box. So despite the lower price, and being comparable to the Noctua NF-A14 FLX in performance, I will stick with Noctua in the future as I have never had a damaged fan on arrival from them in over 12+ years. It's a shame they can't improve their quality control at whatever factory in China (Only "engineered" in Germany / Made in China on package) they get these made in. They are extremely quiet, move a lot of air, and are cheaper than most of their competitors like Be Quiet!, Noctua, Corsair, etc.
So my advice is to manually spin the blades when you get one, and if you hear any type of odd noise, save yourself the time and go ahead and return/exchange it.