Some Enermax user comments from newegg, some of which appear to reinforce SPCR comments:
bought 2 of these for newest personal build and am very disappointed! fans will only run if you spin them by hand when you turn on the power
I have fiddled by moving the blade in and out slightly till it spins freely. The "fix" lasts for only a few seconds. My new 1900xt failed, too, and is in the RMA loop
I can hold a lighter 1 inch away from the fan and it barely makes the flame flicker!
The magnetic fan bearing design that this uses is really a smart idea, however it is flawed. The for this to work, both the base, and fan need to be aligned for the motor to work properly, as the fan starts to spin, the force of the air displaces the fan, moving it out of alignment, then the motor does not work, and the fan slows down. Once it slows down enough, it re-aligns, speeds up, and the process starts over again. This constant oscillation moves almost no air... (PS - I build silent pc's, so i'm aware of air flow / noise ratio, these are worthless by comparison to over silent fans available)
after about 3-6 months, the fans start buzzing, vibrating, running unsmoothly, making a loud noise in the computer housing. Tapping the fan will make it run quietly for a few minutes, before it begins again. When I got irritated enough I replaced it it with the next of the eight I bought, and had the same experience. After a year and a half, I am on fan four or five out of eight.
Was practically noiseless for the first week or so, then an extremely annoying, loud vibration set in. It could be reduced somewhat by loosing the screws attaching it to the case, but not eliminated
DOES NOT SPIN ON STARTUP! You have to manually start the blades moving like its a world war one biplane!
Detachable blades for cleaning, nice feature. Push a lot of air... but most LOUD fans do... see CONs...
18db??? ARE YOU KIDDING ME? The WHOLE reason I bought these were based on all the "OH they are soooo quiet" reviews... and still push so much air. W/E... I just spent an hour swapping out the fans supplied with the Corsair H70 cooler which are loud as hell at least 35db and guess what... these are as loud... however not as shrilling loud. Still. Totally disappointed. And to boot my temps in my Prime95 torture test about about 10deg off of what I had with the Corsair fans.
Amazingly noisy at full speed.
It's air noise, not bad bearings or poor construction. The 18dB rating is simply false. I am here looking for replacements, because the 3 fans in my equipment cabinet are just too distracting, even when slowed to 700 rpm. They are much noisier than the 2 120mm fans that came with my Lian Li PC-C50B HTPC case
I am using this on an air intake and something about it just doesn't stay very quiet. Easily the loudest fan in my system and the exhaust fan (thermaltake) came with the case and the CPU fan (Coolermaster) came with the H212+ cooler i bought. It's on quiet mode too...really odd
Amazing air flow! When it's running at 1500 RPM, the temperture of my computer drop down from 41 to 33!. However, the noise level supposed to be 58 dB! It's not a joke. If you are looking for a super slient case fan. This one is not your choice!. But if you set this run at 1000 RPM, it's much more slient. Still more noiser than Scythe S-FLEX.... This company claim this fans only have 18 dB. It's a joke!.
This fan makes a little bit of a funny noise that it made ever since the first time I turned it on. I think the sound is coming from the shape of the fins. If i cover a small portion of it with paper and change the shape of the air draw, the noise goes away. Goofy but if you notice that sort of thing and it bugs you, maybe look elsewhere
After two months of use, one of the fans started giving me a grinding noise, I'm still dealing with it but I think its just dust.... Great fans, quiet and worth every penny. As long as you clean the dust away regularly that is.