Scythe Gentle Typhoon 120mm

[Buttnose]

http://www.scythe-eu.com/en/press-r...le-typhoon-case-fans-by-nidec-servo-corp.html
http://www.scythe-eu.com/en/products/fans/gentle-typhoon-120-mm.html
(Divide the m3/h values by 1.7 for cfm)

Just saw these after having posted in another thread recommending Low RPM YL's. Can't find any mention of them here or any proper reviews anywhere. I'm wondering if anyone owns some of these and if they can give some opinions or comparisons to other popular fans.

The most info I can find so far is on spcr:
http://www.silentpcreview.com/forums/viewtopic.php?t=50955
http://www.silentpcreview.com/forums/viewtopic.php?p=431970&sid=ab6f9f99e44d26ae6bb930a287030365

£8.50 inc vat, per fan comes into the same price bracket as slipstreams, at least here in the UK. Seems to me to generally be an appreciable drop in noise for a big drop in airflow.

Slipstreams:
7.50 dBA / 24.50 CFM - 500rpm
10.70 dBA / 40.17 CFM - 800rpm
24dBA / 68.54 CFM - 1200rpm
33dBA / 88.11 CFM - 1600rpm
37dBA / 110.31 CFM - 1900rpm

Gentle Typhoons:
5 dBA / 18.23 CFM - 500rpm
9 dBA / 28.23 CFM - 800rpm
16 dBA / 37.05 CFM - 1150rpm
21 dBA / 50 CFM - 1450rpm
28 dBA / 57 CFM - 1850rpm

S-Flex:
8.7 dBA / 33.5 CFM - 800rpm
20.1 dBA / 49 CFM - 1200rpm
28 dBA / 63.7 CFM - 1600rpm
35 dBA / 75 CFM - 1900rpm

Yate Loons:
28 dBA / 47 CFM - 1350rpm
33 dBA / 70.5 CFM - 1650rpm
40 dBA / 88 CFM - 2200rpm
25dBA / 46 CFM - 1000rpm *140mm*
29dBA / 62 CFM - 1400rpm *140mm*

Based on Scythe's official numbers I doubt the noise difference will be very noticable till about 1150rpm where the difference in dBA begins to immerge, a difference of 8/12/9dBA respectively.

This time based on numbers and price I'd still go for a 1350rpm Yate Loon over the 1850rpm GT, as a difference in 10CFM to me simply isn't worth double the price for the same dBA, although perhaps others feel differently? I also trust YL's ratings to be more accurate than Scythe's, otherwise its more than a little impressive how the GT keeps up with the 140mm YL's.

I'm tempted to replace my ZM-F3s for a pair of the 1450rpm GTs, would be a no brainer for me if they were £5 each. Hope someone does a review soon!

-Edited to add S-Flex numbers and opinion.

Comparing the S-Flex and GT yields some quite odd results, at least on paper.

The 800rpm S-Flex pushes 5.27 CFM more air and produces .3dba less noise than the 800rpm GT.

The 1200rpm S-Flex pushes 11.95 CFM more air and produces 4.1dba more noise than the GT at 1150rpm.

But comparing them at closer dba (21 to 20.1) and not rpm the GT pushes 1 CFM more air at the cost of .9dba. I'm guessing that if the S-Flex was undervolted to produce 21dba it would be pushing the same or more air (scale the 1200rpm air:noise down - not very sure what i'm implicating here)

When both fans are producing 28dba you can see that the S-Flex pushes 6.7 CFM more air for exactly the same noise level.

So it would seem overall the S-Flex still pushes more air for less noise.

Also notice in both previous comparisons the GT is spinning 250rpm faster than the S-Flex. I'd say it would be reasonable to argue that a rpm increase that great would not actually yield the same noise level, or at least that it would produce a more noticable pitch of noise; so 28dba-28dba may not actually be as equal as it seems.

Keeping in mind that I've had neither of the fans on hand to test, I'd still recommend the S-Flex over the GTs since most of the results of comparison seem to be in its favour, or indicate that actual noise:airflow of S-Flex would be better.

 

[Buttnose]

What am I doing here if comparing both 800rpm fans:

33.5cfm - 28.23 = 5.27cfm difference

5.27cfm / 3 = 1.75 cfm

I want a result that shows the dba increase required to produce x airflow, to validate what I'm saying about the S-Flex pushing more air at 21dba.

 

[sirmonkey1985]

CFM to noise is usually based on the fan blade designs.. if you really want a silent case with decent airflow.. take a look at the noctua 120mm 1300rpm vortex fans they do about 60 CFM at 17dB.. they are pricier.. but well worth the extra money.. i run 3 of them in my xclios wind tunnel case.. 2 on the case and 1 replacing the stock fan on my big typhoon VX heatsink..

 

[hardsha]

Is there any recommendation about preferable orientation of S-Flex and Kama Flow (horizontal or vertical orientation)?

I have heard that if i need fan with horizontal orientation (=vertical axe of fan), GentleTyphoon (with ball bearing) will be better choice then S-Flex and KamaFlow(modified sleeve bearing). Is it true?

 

[scaarbelly]

I have 1150 and 1450 GT's and both are dead silent. As far as orientation is concerned, I don't think it really matters with any of these fans. They will last you plenty.

 

[Korben Dallas]

Is there any recommendation about preferable orientation of S-Flex and Kama Flow (horizontal or vertical orientation)?

I have heard that if i need fan with horizontal orientation (=vertical axe of fan), GentleTyphoon (with ball bearing) will be better choice then S-Flex and KamaFlow(modified sleeve bearing). Is it true?

S-Flex series of fans has the S-FDB (Sony fluid dynamic bearing)

They can be mounted in any orientation and are VERY nice bearings. I have 1200rpm S-Flex fans and I can't hear the turning of the bearing at all, just the wooshing of the air.

Don't know about Kama Flows.