Fan Testing Part 2 (Retesting + Noise)

[Brodholm]

Most of the fans are new with the exception of the UK3, Yate Loon LED, and Yate loon SL-C. The UK3 I've used for radiator testing only, the yates, I've had in use off and on. All the others have had less than a couple of hours on them.

ok, then it shouldn't matter much. But fans that have been used for 6 months or so often sound much more.

I agree on the noise. dB is a measurment of sound "Quantity" and that does not necessarily relate to "Quality", that's only something you can really judge by ear, and different for every one person.

How did you think that the GT sounded compared to the S-flex E. Because if it sounds better I will be better of with the GT instead. And I have heard that people says it have a special sound.

I've updated the charts in the OP to include the RPM data. The GT I tested was the "AP-15" version which is the 1850RPM spec version, although mine only tested out up to 1740RPM on the radiator. RPM specs are only approximate numbers is what I'm finding, some are WAY off too.

This was very useful. I can see that the sflex E can drop down to 350rpm at 5 volts but the GT only goes down to 700rpm. but I can always get the 1150rpm variant of the GT. But at 350 rpm i doubt that the E moves much air through a radiator.

Not sure you could swap blades or not, I believe the GT has a unique motor to handle the extra blades, so that may not work out in the end anyhow.

It probably have a high number of poles. If you spin the blades by hand you should be able to feel the magnetic steps. They probably have very small magnetic steps compared to others.

Anyhow, I've update the OP with some better charts.

Here is a "test" that a member (zgundam) from silentpcreview did:

http://www.silentpcreview.com/forums...b930a287030365

Update: Done some quick tests of the fans. I don't have any expensive airflow or sound-measuring equipment, so my opinions will be somewhat subjective.

Both 1450rpm and 1850rpm fans were tested at 12v and 7v (using this kind of fan adapter), with a Corsair HX620 supplying power only to one fan at a time and nothing else. Room was completely quiet (no car noise, etc). Tests were performed in open air with no obstructions within 30cm behind or in front of the fans, in vertical position. Two distances used to measure fan - about 10cm and approx 50cm from my ear to fan hub. I did a quick comparison between these fans and a 1200rpm SlipStream and a EbmPapst 4412 FGMLL.

The 1450rpm was surprisingly quiet (but not silent) at 12v. While at 7v it wasn't completely silent, giving a very low continuous hum, noise character it's probably comparable to the 1200rpm SlipStream at 7v. Airflow could probably be compared against a EbmPapst 4412 FGMLL @ 7v.

The 1850rpm Gentle Typhoon was noticeably louder than the 1450rpm version at both 12v and 7v, but not annoying. Airflow felt comparable to a 1200rpm SlipStream.

Both fans have very unique noise signatures (really don't know how to describe, sorry) which I haven't heard from other fans so far, but it's definitely very easy on the ears.

To summarise, the Scythe Gentle Typhoon seems to be a serious competitor for (at least) the 1200rpm Slip Stream. It's got a high MTBF, costs the same as a Slip Stream (at least in Japan anyways) and, from initial impressions, very quiet with good noise character. I just wish Scythe would start distributing these worldwide asap so I can get them cheaper!

Will see if I can get some audio samples done (assuming my mobiles' crappy mic is up to it), but I'd be happy to submit both samples to SPCR for proper testing (as long as I get them back in one piece. and working of course. Razz) if they're interested?

And also, Do you know if it is possible to remove the blades from the motor? Or if it is something special. Because that gray color is ugly as imo and i would want to repaint them.