San Ace 9S1212H4011 25mm High Speed

Special thanks to SeeingRed for sponsoring this fan..

I've always admired the industrial quality the 38mm fans seem to have, so I was pretty excited to see that packaged in a 25mm version. I have yet to test a 38mm fan that doesn't tick to some degree when undervolted, so could it be possible that this will be an ultra high speed fan with San Ace quality and no motor tick when undervolted? Sure is...

NOISE LEVEL
Came in about .5 to 1dbA higher than the yate medium and higher than average compared to the whole pack of fans up to 2000RPM. However in comparison with the previous two 38mm 3000RPM fans the UK3 and PanafloU, it had about the same noise level...about average for an ultra high speed fan.

NOISE QUALITY
Unlike most ultra high speed fans that are typically 38mm in thickness and have annoying motor tick noises when undervolted, this fan is exceptionally smooth for an ultra high speed fan. Overall the noise quality is fairly impressive, you really don't hear any motor noise, it seems the noise all comes from the fan blades themselves in the form of an air/blade/turbulence type noise. I'd say very good noise quality compared to 25mm fans, and exceptional noise quality compared to all other fans capable of 2500RPM. This is the one fan I could see using in ultra high speed 2500RPM and still being happy with the noise quality when undervolted.

OVERALL
While this fan may actually record higher than average noise level numbers, the noise quality is exceptionally good. It would be my first pick so far if looking for a fan with ultra high speed fan performance that needs to undervolt well at the same time. It's sort of a hybrid between your typical 25mm fan and an ultra high speed 38mm fan without the motor tick problems most 38mm fans seem to present.

I give it a thumbs up for being the strongest fan tested so far that has very good noise quality (no motor tick). I'm also going to give it a thumbs up for it's industrial qualities and smooth motor free of any irregularities or resonance issue. I guess I'm just happy to finally have a really strong(2500RPM) fan in the bunch that's smooth down at lower volts.

VIDEO LINK
http://www.youtube.com/watch?v=r4IuCb5fLKc







COMPARED TO ALL FANS TESTED SO FAR