Quote Originally Posted by Brodholm View Post
I want a really silent fan, I have been thinking about the S-flex E (1200rpm) I have had one and i know it is very silent. But then i saw this test with the Gentle Typhoon showing very good results. Would you recommend it over the s-flex?

And I know that fans sound more the older they get. Have you been using new fans or used fans?

http://www.scythe-eu.com/en/products...on-120-mm.html
http://www.scythe-eu.com/en/products...-case-fan.html

There is also a difference in sounds. Not just db. Some noise is worse than others. I know vapor said that the sflex sounds nice. Probably because of the
S-FDB (Fluid Dynamic Bearing by SONY Corporation) i think. I'm buying 10 s-flex E next week but now you got me unsure, DOHH! Maybe I should go with the GT...

Info from scythes site:

Gentle Typhoon 120 mm Fan
(500 rpm - 800 rpm - 1,150 rpm - 1,450 rpm - 1,850 rpm)

Technical Data:
500 rpm: 0.015 A - 5 dBA - 31 m³/h
800 rpm: 0.023 A - 9 dBA - 48 m³/h
1,150 rpm: 0.034 A - 16 dBA - 63 m³/h
1,450 rpm: 0.049 A - 21 dBA - 85 m³/h
1,850 rpm: 0.083 A - 28 dBA - 98 m³/h

Bearing Type: Double Ball Bearing

Accessory: 4-pin Molex Adapter, 4x Screws

MTBF:
100,000 h / 35°C or 60,000 h / 60°C
*1,850 rpm Model 55,000 h / 60°C


Model Number:
S-FLEX SFF21D (800 rpm)
S-FLEX SFF21E (1,200 rpm)
S-FLEX SFF21F (1,600 rpm)

Specifications:

800 rpm Version: 33.5 CFM = 58 m³/h | 8.7 dBA | DC 12 V | 0.10 A
1,200 rpm Version: 49.0 CFM = 83 m³/h | 20.1 dBA | DC 12 V | 0.15 A
1,600 rpm Version: 63.7 CFM = 109 m³/h | 28.0 dBA | DC 12 V | 0.20 A
1,900 rpm Version: 75.0 CFM = 127 m³/h | 35.0 dBA | DC 12 V | 0.24 A

Connector: 3-pin (4-pin adaptor included)

Cable Length: 30 cm / 11.81 in

Bearing Type: S-FDB (Fluid Dynamic Bearing by SONY Corporation)

MTBF: 150 000 hours


You tested the 1850rpm variant right? Do you have a graph on specific rpm at volt? And have you tried push/pull in noise difference?

I wounder what happens if you make a blade swap with s-flex and GT

Edit: I also found this the other day

http://www.techpowerup.com/92728/Scy...ries_Fans.html

To bad they didn't release a 140mm model
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.

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.

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.

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.

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