Scythe new silent fans

PowerSlide · 16th Jan 2006, 05:33 AM

spec

* SFF21D -> 800 rpm, 33.5 CFM, 8.7 dB, 12 V, 0.1 А;
* SFF21E -> 1200 rpm, 49.0 CFM, 20.1 dB, 12 V, 0.15 А;
* SFF21F -> 1600 rpm, 63.7 CFM, 28.0 dB, 12 V, 0.2 А.

http://translate.google.com/translat...language_tools

wow..8.7 dB but errr i cant be bothered coz it cant blow a mosquito..but its really for silent freaks

Olle P · 16th Jan 2006, 06:44 PM

Quote:

Originally Posted by PowerSlide

wow..8.7 dB but errr i cant be bothered coz it cant blow a mosquito..but its really for silent freaks

Better to get the 21F and run it at 6V to get the same result, but have extra performance to spare when needed.

Cheers
Olle

Chai · 16th Jan 2006, 09:22 PM

The bearing and motor could be different, that makes all the difference to silent freaks.

Olle P · 16th Jan 2006, 10:13 PM

I bet it's just the motors that differ, which in turn provide different speeds at the same voltage.
Since everything else is the same and performance/speed thus is directly proportional to the voltage (within limits) then a voltage adjustment is all it takes!

(The noise is proportional to the speed^5.)

Cheers
Olle

Chai · 16th Jan 2006, 11:48 PM

Not really. Even motor generates noise on its own, regardless of fan speed. So noise is not proportion to the speed, especially at very low speed. Fan turbulence is not the major factor anymore.

Instead of the noisy whirling noise, the motors generate noises like 'tik tik' etc.

Papercut · 16th Jan 2006, 11:50 PM

Those are fairly impressive specs. I hope they're not exaggerated like some other companies'.

Olle P · 18th Jan 2006, 01:37 AM

Quote:

Originally Posted by Chai

Not really. Even motor generates noise on its own, regardless of fan speed. So noise is not proportion to the speed, especially at very low speed. Fan turbulence is not the major factor anymore.

You're correct of course, but that doesn't allow for a correct assumption of engine and bearing noise at other than rated speeds either...

Cheers
Olle

Chai · 18th Jan 2006, 10:19 AM

Quote:

Originally Posted by Chai

The bearing and motor could be different, that makes all the difference to silent freaks.

Could is the key word.

PowerSlide · 19th Jan 2006, 08:55 AM

seriously..i dun have a clue wat u guy toking

wen i shop for fans jus see the cfm n dBa rating..tats it

aKho · 19th Jan 2006, 09:17 AM

Quote:

Originally Posted by PowerSlide

wen i shop for fans jus see the cfm n dBa rating..tats it

i duno much about cfm n dba..i just do it the old fashion way, physically testing it out..

e.g. plug-in fan, wahh! not bad not bad, very strong wind, ok i buy.

16th Jan 2006, 05:33 AM	#1 (permalink)
PowerSlide Super Active Join Date: 28 Aug 2004 Location: Penang, Malaysia Posts: 1,402 Reputation: 871 Rep Power: 14	Scythe new silent fans spec * SFF21D -> 800 rpm, 33.5 CFM, 8.7 dB, 12 V, 0.1 А; * SFF21E -> 1200 rpm, 49.0 CFM, 20.1 dB, 12 V, 0.15 А; * SFF21F -> 1600 rpm, 63.7 CFM, 28.0 dB, 12 V, 0.2 А. http://translate.google.com/translat...language_tools wow..8.7 dB but errr i cant be bothered coz it cant blow a mosquito..but its really for silent freaks Last edited by Chai : 16th Jan 2006 at 10:45 AM. Reason: Fixed the link

16th Jan 2006, 09:22 PM	#3 (permalink)
Chai Administrator Join Date: 6 Oct 2002 Location: Maranello Posts: 26,757 Reputation: 3984 Rep Power: 72	The bearing and motor could be different, that makes all the difference to silent freaks. __________________ Chai (Contributor & Forum Admin) http://www.techarp.com/

16th Jan 2006, 10:13 PM	#4 (permalink)
Olle P Active Join Date: 12 Jan 2005 Location: Sweden Posts: 815 Reputation: 315 Rep Power: 7	I bet it's just the motors that differ, which in turn provide different speeds at the same voltage. Since everything else is the same and performance/speed thus is directly proportional to the voltage (within limits) then a voltage adjustment is all it takes! (The noise is proportional to the speed^5.) Cheers Olle __________________ If you're not living on the edge you take up too much space... Asus A8E-N, Athlon64 X2 4600+, 1024MB Kingston value, XFX GF7800GT, Seagate 160GB/8MB

16th Jan 2006, 11:48 PM	#5 (permalink)
Chai Administrator Join Date: 6 Oct 2002 Location: Maranello Posts: 26,757 Reputation: 3984 Rep Power: 72	Not really. Even motor generates noise on its own, regardless of fan speed. So noise is not proportion to the speed, especially at very low speed. Fan turbulence is not the major factor anymore. Instead of the noisy whirling noise, the motors generate noises like 'tik tik' etc. __________________ Chai (Contributor & Forum Admin) http://www.techarp.com/

16th Jan 2006, 11:50 PM	#6 (permalink)
Papercut Hyperactive Join Date: 14 Jul 2004 Location: Singapore! Posts: 4,990 Reputation: 2428 Rep Power: 33	Those are fairly impressive specs. I hope they're not exaggerated like some other companies'. __________________ PC Specs "Use in a cool dry place away from direct sunlight. Keep out of reach of n00bs. Overclock within 24 hours of opening. Do not read instructions before proceeding, do not use only as directed. May cause frustration, late nights and empty wallets. If symptoms persist please consult your hardware professional."

19th Jan 2006, 08:55 AM	#9 (permalink)
PowerSlide Super Active Join Date: 28 Aug 2004 Location: Penang, Malaysia Posts: 1,402 Reputation: 871 Rep Power: 14	seriously..i dun have a clue wat u guy toking wen i shop for fans jus see the cfm n dBa rating..tats it

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