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Attack of the Scythes
http://www.silentpcreview.com/forums/viewtopic.php?f=13&t=48060
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Author:  Lawrence Lee [ Fri May 09, 2008 2:35 pm ]
Post subject: 

dhanson865 wrote:
Code:
Number of samples tested: 4


Please note that we only tested one sample of each fan. The number of samples is how many we have at our disposal - they were checked quickly to see if there was any variance in how they sounded.

Author:  oscar3d [ Fri May 09, 2008 2:50 pm ]
Post subject: 

I knew it, the Slipstream M rocks.

I currently have 2 of them in my system....

the only thing though is that I didn't know that they really move 47CFM at 12v instead of the 68CFM Scythe claims.

In other words, between the Nexus 120 Real Silent D12SL and the Slipstream M there should be almost no difference right?

So both move 47CFM... doing the comparison.

Please correct me if I'm wrong.

Author:  Lawrence Lee [ Fri May 09, 2008 3:44 pm ]
Post subject: 

oscar3d wrote:
In other words, between the Nexus 120 Real Silent D12SL and the Slipstream M there should be almost no difference right?

So both move 47CFM... doing the comparison.

Please correct me if I'm wrong.


Did you not see the updated results for the Nexus fan? It pushs 29CFM @ 12V with the new testing methodology.

http://www.silentpcreview.com/article695-page2.html#nexus

Author:  dhanson865 [ Fri May 09, 2008 7:07 pm ]
Post subject: 

oscar3d wrote:
Please correct me if I'm wrong.


In addition to the previous post you might want to look at my prior post in this very thread where I went on in great detail about the comparison of the Slipstream M 1200 and the Nexus 120mm.

Here is a tiny recap:

Code:
Nexus D12SL-12     12V  22dBA 1080RPM 29CFM
Starting Voltage 5.5V

Code:
Slipstream  M 1200 12V  28dBA 1210RPM 46CFM
Starting voltage 2.4

Author:  NeilBlanchard [ Fri May 09, 2008 7:09 pm ]
Post subject: 

Hello,

So, the Slipstream 1200RPM must be used at ~7v or less (21-18dBA & 890-620RPM) in order to be quieter than the Nexus (22-19dBA & 1080-490RPM). 7 volts on the SS 1200 is approximately the same noise (21dBA) as the Nexus at 12v (22dBA), while the CFM at those speeds are 30CFM vs 29CFM. The Slipstream is quieter and blows a bit more air.

http://www.silentpcreview.com/article832-page3.html#SS-M
http://www.silentpcreview.com/article695-page2.html#nexus

In terms of noise, the 800RPM Slipstream would seem to be better (19-<18dBA) overall. (Only the 500RPM Slipstream is quieter!) And at the same RPM/noise level the 800 matches the 1200RPM. So if you can tolerate the louder noise, then the 1200RPM can give you headroom (but at the "cost" of 28dBA!), but if you want a quiet fan no matter what, the 800RPM would seem to be better.

Author:  rivet [ Sat May 10, 2008 5:58 am ]
Post subject: 

I notice that the SH slip stream model (1900rpm) working at 9v (1340rpm) at 26dBA is quieter than the M model (1200rpm) working at 12v (1200rpm) at 28dBA, is this likely a sample variation, or the nature of these fans? If so, maybe running SH model at 9v is a better idea if I can tolerate 26dBA. Thanks.

Author:  Fred [ Sat May 10, 2008 3:35 pm ]
Post subject: 

How would the 1200 RPM slipstream at full speed compare to a tricool on the medium setting in terms of noise?

Author:  FartingBob [ Sat May 10, 2008 3:59 pm ]
Post subject: 

Fred wrote:
How would the 1200 RPM slipstream at full speed compare to a tricool on the medium setting in terms of noise?

Ive used both, and really i find the 1200rpm at full voltage is only a bit louder than the tri-cool on low, whilst pushing a lot more air.

Author:  rivet [ Sat May 10, 2008 6:37 pm ]
Post subject: 

Can confirm this, the medium feels much lounder than the 1200rpm slipstream
FartingBob wrote:
Fred wrote:
How would the 1200 RPM slipstream at full speed compare to a tricool on the medium setting in terms of noise?

Ive used both, and really i find the 1200rpm at full voltage is only a bit louder than the tri-cool on low, whilst pushing a lot more air.

Author:  Fred [ Sun May 11, 2008 4:47 am ]
Post subject: 

Awesome, thanks =)

Author:  dhanson865 [ Sun May 11, 2008 1:26 pm ]
Post subject: 

Tricool 120mm on Medium 27dBA 1430RPM 36CFM
Slipstream M 1200 12V 28dBA 1210RPM 46CFM

Tricool 120mm on Low 20dBA 870 RPM 21CFM
Slipstream M 1200 7V 21dBA 890RPM 30CFM

Definitely better CFM to dBA ratio on the slipstream

Author:  MajmuN [ Mon May 12, 2008 2:49 am ]
Post subject: 

Fred wrote:
How would the 1200 RPM slipstream at full speed compare to a tricool on the medium setting in terms of noise?


I have both fans, and Slipstream at 12v sounds a lot more than TriCool at low, though TriCool at medium is slightly louder than the Slipstream at 12v - slightly.

Author:  lethul [ Mon May 12, 2008 2:53 am ]
Post subject: 

Are Scythe's available in any other size than 120mm?

Author:  dhanson865 [ Mon May 12, 2008 5:59 am ]
Post subject: 

Scythe makes fans in every size imaginable but Slipstreams are only available in 120mm.

There are however two 100mm fans that look like a slipstream (13 blades vs the 9 blades on a slipstream) but aren't named that way. KAZE JYU SLIM


A reasonably complete list of Scythe fans is at http://www.scythe-usa.com/product/acc_top.html

Author:  NeilBlanchard [ Mon May 19, 2008 8:30 am ]
Post subject: 

Hello,

The link to the Ultra Kaze 1000 leads instead to the last page of the article:

http://www.silentpcreview.com/article832-page6.html#ULTRA-1000

Author:  alphabetbackward [ Fri May 23, 2008 11:05 am ]
Post subject: 

For those numbers posted on the Antec fans...something doesn't seem right. On the back of the retail one I bought, it's:

Low = 1200
Medium = 1600
High = 2000

...and plugging them into the motherboard yields similar numbers.

Or are the stock Tricools that much different than the retail?

Author:  dhanson865 [ Fri May 23, 2008 8:16 pm ]
Post subject: 

Did your Tricool have LEDs in it?
http://www.antec.com/pdf/flyers/TriCool_LED_Fans.pdf

was it without LEDs?
http://www.antec.com/pdf/flyers/TriCool.pdf

How about Double Ball Bearing?
http://www.antec.com/pdf/flyers/TriCool_DBB.pdf

Or were they Black?
Sorry I don't know the PDF for that one.

Anyway if you look at http://www.silentpcreview.com/article69 ... ml#tricool you'll see the same 1,200 / 1,600 / 2,000 RPM listed specs.

The RPMs we are quoting are as tested not as specified. There are many reasons why the numbers vary. We prefer to use the SPCR numbers to keep the variables to a minimum. Though I think I see what you are getting at:

Rated/Measured
2000 RPM / 1930 RPM
1600 RPM / 1430 RPM
1200 RPM / 870 RPM

There is a 1530 RPM and 1220 RPM measured in the review but they aren't labeled as medium and low. Is that a mistake in the review or a difference between specified and measured?

Author:  Ash [ Fri May 30, 2008 2:33 pm ]
Post subject: 

are the specific slipstreams limited to the rpm,

i am using a 1200 on my cpu, and it is almost always spinning at around 1250, sometimes seen it reach 1300.

i also managed to get some 800's shipped to uk, and they are also running over 800.

nothing alarming, just curious. or is it just the program giving false readings. i am using everest,

Author:  MikeC [ Fri May 30, 2008 3:11 pm ]
Post subject: 

Ash wrote:
are the specific slipstreams limited to the rpm,

i am using a 1200 on my cpu, and it is almost always spinning at around 1250, sometimes seen it reach 1300.

i also managed to get some 800's shipped to uk, and they are also running over 800.

nothing alarming, just curious. or is it just the program giving false readings. i am using everest,

Fan speed monitoring devices are just not that accurate, and the fans themselves vary a bit in rpm/voltage -- they probably all hit 1200rpm, but at slightly different voltages -- one at 11.5, another at 12, another at 12.5. I would like to actually make RPM the reference control rather than voltage, but the challenge then is to try and get the RPM readings as accurate as possible... which, as I started this note with, is hard because the tachometers are not that accurate.

Author:  jaganath [ Fri May 30, 2008 4:36 pm ]
Post subject: 

Quote:
I would like to actually make RPM the reference control rather than voltage, but the challenge then is to try and get the RPM readings as accurate as possible


FelgerC's stroboscopic method is good although labour-intensive, detailed in his "User Reviews" posts. also, as u note, most fans will have as much as a +/-10% variation in top speed and still be "within spec".

Author:  NeilBlanchard [ Fri May 30, 2008 7:21 pm ]
Post subject: 

Hello,

Also, your altitude will affect the speed, and maybe the current atmospheric pressure?

Author:  Felger Carbon [ Sat May 31, 2008 12:06 pm ]
Post subject: 

jaganath wrote:
Quote:
I would like to actually make RPM the reference control rather than voltage, but the challenge then is to try and get the RPM readings as accurate as possible

FelgerC's stroboscopic method is good although labour-intensive, detailed in his "User Reviews" posts.

Labor-intensive because I was using one stroboscope to measure both the sensor prop RPM and the fan under test RPM. If only the fan under test, and only one desired RPM, it actually is labor-efficient to set the stroboscope to the desired RPM and adjust the fan voltage until the strobe image is stable. That can be accomplished, start to finish, more quickly than by any other method I know of.

Author:  burn-x [ Mon Sep 22, 2008 4:33 am ]
Post subject: 

Minor error: The content table link for Scythe Ultra Kaze DFS123812L-1000 is not right. It goes to page 6 when it should be page 5.

Author:  fernstroem [ Sun Oct 19, 2008 5:08 am ]
Post subject:  Great review!

Hi!

Thanks for a great review! Much appreciated!

Best regards
Fernstroem

Author:  samuelmorris [ Fri Apr 24, 2009 8:04 am ]
Post subject: 

I'm interested in going for some SH 1900rpm Slipstreams. The reason being that I need fans with a good low noise level for idle usage as they're used in a block of four, hooked up to the same fan controller output for simplicity (I will use two per channel with slipstreams due to the power usage. I'm running a Sunbeam Rheobus and Rheobus Extreme, so I'm not too worried about current draw).
The reason for going super high is this is for my gaming system, which has a pair of noisy 4870X2s in it (that are only at all noisy under load). However, since they run very hot, and on top of that I may eventually consider fitting Accelero Extremes on them when they arrive, so air blows into the case, I need a hell of a lot of airflow, so would like the full band of potential speed.

Can I just therefore check, the SFF21F at 1600 (which is a relatively powerful fan compared to most of the ones I use) is 47CFM, and these 1900rpm slipstreams are 71? A 50% increase in CFM for 20% extra rpm?
I realise the 9-blade vs 7-blade design achieves this (though I'm aware of the extra noise), but it seemed a lot, so I wanted to check before I spend £40 on buying four of them.

Cheers

Author:  NeilBlanchard [ Fri Apr 24, 2009 5:57 pm ]
Post subject: 

Hi,

I think that four 1200RPM Slipstreams would be plenty, and if you are still not getting the air flow -- cut out the grills!

Author:  samuelmorris [ Sat Apr 25, 2009 11:27 am ]
Post subject: 

Heh, would prefer the grille to remain intact as that's all there is that makes up most of the side to my case (HAF932). 1200rpm would possibly be enough, and indeed 700rpm would probably do me in York, but even with an Ultra-120, a 1600rpm SFF21F on it, correctly fitted with good paste, my CPU reached 105ºC and shut down (Main temp, not cores) the other day due to the environment. I've sinced moved back to my student house and cut the temps in half, almost literally, but needless to say, some brute force cooling might do me good for when I go back in July in the peak of summer. Since the 1200rpm fan is no cheaper, I didn't see much to be lost.

Author:  Das_Saunamies [ Tue Aug 25, 2009 7:31 am ]
Post subject:  1900 RPM SS not slowing down

I bought the 1900 RPM model based on the review, and I can't get it to go below 1300 RPM on my Abit IP35 PRO. I've tried all the different voltage options, but it simply will not go as low as the review said.

It is now spinning at 1300 RPM with a voltage of 6V, as claimed by Abit's µGuru. The fan is drawing power from AUX_FAN3.

Is this sort of thing common? At least one person in this thread has had his 1900 RPM model slow down properly, so I'm thinking WTH.

Author:  samuelmorris [ Tue Aug 25, 2009 7:34 am ]
Post subject: 

Fans like the Slipstream actually speed up exponentially with voltage. If you had 6V instead of 12V, the fan should really be below half speed. A common failing of software fan controllers is that they don't have anywhere near as much of a range as they say. A software controller I used to use claiming 6-12V actually only went from 8V-10.5V. I suspect that is what is happening here. Run the fan through a hardware fan controller and you will get a much lower speed out of it I'm sure.

Author:  Das_Saunamies [ Tue Aug 25, 2009 8:31 am ]
Post subject: 

Am familiar with the conundrums, but µGuru with all its BIOS-based capability has so far served me well. Every other fan slows down as it should.

My 1600 RPM S-Flex intake slows down like stated in SPCR review, ditto the 1200 RPM S-Flexs I have taking care of exhaust. Intake running at [email protected], exhausts [email protected], review here: http://www.silentpcreview.com/article69 ... html#sflex.

The fault is definitely with this Slip Stream fan. Have switched headers to no avail. 800 RPM Slip Stream slowed down normally as well, now removed due to serving no purpose after recent purchases.

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