Anyone here use the scythe slipstream 110cfm fan?

[EvilSponge]

Hello all,

I saw scythe has a 110cfm 120mm fan rated @ 38db anyone here use one and how load is it?

-sponge

 

[toadeater]

It really is 38dB @ 1m distance according to X-Bit Labs:

http://www.xbitlabs.com/articl...-roundup_11.html#sect0

 

[WoodButcher]

I use the 1900's w/ a controller. Good stuff.

 

[EvilSponge]

Thanks guys!

-sponge

 

[DerwenArtos12]

Among my favorite fans but, it has low static pressure, so it's not to be used with restrictive grilling, radiators, filters or heatsinks. It's an open air case fan only.

 

[Bluefront]

DerwenArtos12...... I'm not sure where you got that last bit of information, but I've found the Slip-Stream fans to handle "static pressure" as well as most fans, including the Noctua P12 which is designed to handle airflow resistance. Actually the Slip-Stream seems to handle resistance as well as the S-Flex models, and much better than the Yate Loons and Nexus.

In this project, there is a 1200rpm SlipStream providing the majority of the intake and exhaust, not to mention sucking through a filter. The CPU is a P4 that draws 95w, and is also being cooled by that same fan.

 

[DerwenArtos12]

Just from my experience with them. I think we've gone over this a couple times in other threads. I don't really consider the NP12 or the sflex to be great static pressure fans for that matter either in comparison to fans really designed to get a lot of pressure behind them. The blade design has a much smaller surface area per blade so it's inherently not going to handle higher restriction loads as well. It's also a sleeve bearing so it's performance will be hindered a slight bit more even. I'm not saying they're bad fans and the 1600 and 1900 have more than enough rpm to push through a basic filter or even some of more restrictive heatsinks. They are not however going to perform as well based strictly on static pressure and cfm drop in more restrictive enviroments. I've talked to Vapor about it over on XS and he's even less optimistic about the slipstreams than I am. I'm certainly not saying they're bad fans, I love them, I've got about a dozen of them between 4 of the 5 speeds and like them and use them but, strictly based on the design and my experience with them they're not as good as many others with high restriction.

 

[Bluefront]

Well I doubt you could put much more restriction on a single fan than that last link I just posted. And I went through a lengthly fan test before I built the setup in that last link I just posted. The Slip-Stream is handling the restriction without problems.

Just what fan do you propose would handle that setup any better, with an upper rpm limit of 1200? (trying to keep the noise down). I've found plenty of times you cannot judge the performance of a fan simply by looking at the design.....you simply have to try the thing out yourself before passing judgment.Extensive three-part fan testing for resistance effects.

 

[Jessica69]

Originally posted by: Bluefront
Well I doubt you could put much more restriction on a single fan than that last link I just posted. And I went through a lengthly fan test before I built the setup in that last link I just posted. The Slip-Stream is handling the restriction without problems.

Just what fan do you propose would handle that setup any better, with an upper rpm limit of 1200? (trying to keep the noise down). I've found plenty of times you cannot judge the performance of a fan simply by looking at the design.....you simply have to try the thing out yourself before passing judgment.Extensive three-part fan testing for resistance effects.

But according to your own testing, the Slipstream was the fan, out of the four you tested, that was almost the most affected by restriction.....naturally, the Noctua was the worst. While it did produce cooling temps like the S-Flex, it had the third worst rpm drop of the fans, which shouldn't be too surprising given the Slipstreams use such a thin bladed fan design.

From what I've been able to glean from testing in free air vs. radiators, in tests using anemometers, very thin bladed fan designs typically fare worse than fans with fewer but wider blades. See Vapor's two fan tests at XS....one of the more exhaustive fan tests I've encountered.

And the Slipstreams have going against them the sleeve bearing design.....a bearing design notorious for being cheap, noisy....esp. with position changes, and fast to wear out.

 

[Bluefront]

In the final series of tests, the best of the fans handled resistance almost equally. The differences were too close to judge. Another set of tests would scramble the order of finish. In other words......the Slip-Stream handled airflow resistance with the best of the fans. There was no clear winner.

As far as fan life-span in such setups is concerned.....unknown. Presumably, fans with better bearings last longer. If you're concerned with this.....use the S-Flex with the Sony bearings. The fan is heavier, and costs more, and preforms very similar to the Slip-Stream.

I'm still looking for a 120mm fan to test that might be a clear winner in it's ability to handle resistance at low noise levels.

 

[EvilSponge]

Well my slipstream 120mm fan just arrived today I'll be performing three tests config 1 is 110cfm slipstream mounted to lapped True120 will use fan controller and recorded temps at various fan speeds. Config 2 is 2 thermaltake 120mm 79cfm fans in push pull config using fan controller and recorded temps at various fan speeds. Config 3 will be single thermaltake 120mm 79cfm fan with controller and recorded temps at various fan speeds I'll report my findings back to this thread for those who may be interested.

-sponge

 

[DerwenArtos12]

Originally posted by: Bluefront
Well I doubt you could put much more restriction on a single fan than that last link I just posted. And I went through a lengthly fan test before I built the setup in that last link I just posted. The Slip-Stream is handling the restriction without problems.

Just what fan do you propose would handle that setup any better, with an upper rpm limit of 1200? (trying to keep the noise down). I've found plenty of times you cannot judge the performance of a fan simply by looking at the design.....you simply have to try the thing out yourself before passing judgment.Extensive three-part fan testing for resistance effects.

I have tried them, and it's still amongst my favorite fans, as I've said before. You can't limit rpm and expect that to set a dbA ceiling. RPM has a direct(and often linear) correlation to cfm but, not to dbA. Take for example a few delta 120mm fans(I generally use delta because I can get the most detailed specs on them). The EFB1212L is 1950rpm with 57cfm @ 31dba and an odd but effective reverse spin tripple blade design. The same design in a 38mm fan in the EFB1212LE runs 2000rpm with 76cfm at 34dba. 50rpm adds 3dba and 19cfm because of the modification in fan design to be half again thicker. Now compare that against the FBA12G12L1BX NMB-PAT panaflo fan that does 1700rpm but still manages 69cfm with only 30dba. 300rpm loss but, due to the differing design only drops 4dbA and 7cfm. My point here is that overall fan design can't tell you the whole story but by far and away makes the largest difference out of any other factor in a fans real world performance.

The reason your data doesn't tell the whole story is because you're using relatively low rpm fans all of which have relatively low static pressures. I'd have to guess that they're all going to be in the area of .1"H2O or less. compare that to really high static pressure fans like the TFB1212GHE that has more than 1"H2O static pressure and my assessment makes better sense.

 

[Bluefront]

It's sort of an apples/oranges thing. I am concerned about restriction effects on relatively slow fans......since I would never use a noisy, high CFM fan. That's why my testing mostly involved slower fans. I ran about 25 different fans through the same series of tests.....although I only reported on about ten. The top six in the tests performed and sounded about the same. I'm looking for a slower speed fan that pushes the same amount of air with/without a filter in front of it.

Obviously an impossible search......but some fans do it better than others. The Scythe Slip-Stream fans are among the best.

 

[DerwenArtos12]

With this low of rpm and subsequent airflow I would be hard pressed to believe any testing methods to be more than subjective. To be accurate testing would have to be competed with an air tight one cubic foot chamber with a sealed intake. For pressure comparison you would need a 1/1000th inch accuracy manometer with the shortest tube manageable between the chamber and the manometer. For airflow a 1cfm accuracy anemometer would work fine but, you'd need a completely separate testing environment. I don't know if any 120mm anemometers are available but 4" would do just fine. You'd need about a four inch to one foot shroud between the fan itself and the anemometer because hub air movement is not going to be the same as open air movement. You would then have to find a way to replicate your filter material. Easiest way I can think of to do that would be to use a shroud on the longer end with a removable box between the fan and the shroud that could be populated with the filter material. Sound pressure measurements are going to be essentially bogus but, can server to compare fans in a given situation. Ideally sound pressure calculations would be taken at 10cm and one meter in open air in a sound proof chamber to keep ambient noise levels below ~10dbA for such slow fans. Given the bearing types to be thorough you'd want to test with and without your filter media and in both vertical and horizontal positioning as sleeve bearings operate worse when horizontal. Anything short of those testing procedures would be as speculative as my assessment and equally as useless.

 

[Bluefront]

Well I disagree.....IMHO, you don't need to go to such extremes to get a pretty good idea how a fan reacts to restriction effects. I made a little box with removable filters, and attached different fans on the other end.......then measured rpm drops at different voltages, and with different filters.

Simple enough. The results were very obvious. Some fans cannot handle filter resistance without a relatively large drop in rpm/cfm. These results are more than just guess-work. And good enough for my purposes.....

Where I writing a scientific paper or something, I'd do it differently. :laugh:

 

[EvilSponge]

Well the results are in under a loaded condition the the slipstream performed the worst and the loudest I guess it must have something to do with the fin difference between the slip stream and the thermaltake so slipstream q6600 @ 3.6 ghz 68c 110cfm, q6600 @ 3.6 ghz with single thermaltake 120mm fan 78cfm fully loaded per prime95 66c, q6600 @ 3.6 ghz 2 thermaltake 120mm fans in push pull configuration both 78cfm prime95 fully loaded 61-62c. All fans mounted to lapped TRUE heatsink with OCZ TIM apllied

-sponge
The slip stream would make a great case fan though