Anyone tried these?

Strages · Oct 31, 2007

I was browsing through fans on Heatsink Factory a few minutes ago and I found these:
http://www.heatsinkfactory.com/scythe-slip-stream-120mm-fan-sy1225sl12sh.html

I about fell out of my chair in amazement - 110cfm at 37dBa!?!?

My experience is yelling "bull****," but I suppose it could be true as it's a 9-blade design. Anyhow, anyone know anything about these?? How are they pressure wise? There has to be some kind of catch with these fans. Otherwise, why would anyone buy anything else???

Automata · Oct 31, 2007

There is no way that is true, the "whooshing" from the air would be louder than 37 db.

I'm calling BS.

EDIT: AND at 1900rpm???? NO WAY. My Ultra High speed panaflo's did 108 at....mid 40's with well over 2-3k rpms.

Strages · Oct 31, 2007

Well, of course it would, but the "whoosing" is just an added noise factor - starting at 45dBa and adding "whoosing" is going to be a lot louder than 37dBa and adding whoosing. But I agree that something else has to be going on here.

bing · Oct 31, 2007

Nowdays axial fan technology is very matured and settled.

Any fan's spec that looks or sounds too good to be true should be treated with grain of salt.

Automata · Oct 31, 2007

bing said:
Any fan's spec that looks or sounds too good to be true should be treated with grain of salt.

grain? GRAIN??? That's it??????

That much salt....

Strages · Oct 31, 2007

bing said:
Nowdays axial fan technology is very matured and settled.

Any fan's spec that looks or sounds too good to be true should be treated with grain of salt.

I'm curious about it because it's a 9-blade design. If it were a traditional 4-5 blade then I wouldn't give a second thought - but it's 9. I don't know how much that would affect airflow. Physics tells me that it should produce more airflow (as it's grabbing more air more efficiently with so many blades), but I think that it would produce less pressure because there is less time to accelerate the air through the blades (it's a 25mm), which is what matters for radiators.

I'm not freaking out and buying 100 of these. I'm just curious to find out if anyone's used them to report on how they are. I'd like to know if it's all bull or if they really are worth looking into - but I like my Panaflo's too much

.

Automata · Oct 31, 2007

Strages said:
I'm curious about it because it's a 9-blade design. If it were a traditional 4-5 blade then I wouldn't give a second thought - but it's 9. I don't know how much that would affect airflow. Physics tells me that it should produce more airflow (as it's grabbing more air more efficiently with so many blades), but I think that it would produce less pressure because there is less time to accelerate the air through the blades (it's a 25mm), which is what matters for radiators.

I'm not freaking out and buying 100 of these. I'm just curious to find out if anyone's used them to report on how they are. I'd like to know if it's all bull or if they really are worth looking into - but I like my Panaflo's too much .

You forgot one thing:

They didn't just add blades, they reduced the size of the blades (from the 4-5 fin design) and then just added more of them :beer:

bing · Oct 31, 2007

My own conclusion on 7 vs 9 blades fan -> HERE

Edit : Those are 38mm fans, thicker means higher pressure.

CGR · Oct 31, 2007

I believe they are as stated. Every site that has them list those specs.

Fan technology has come a fair way recently with fluid ball bearings and the smaller blades, which btw reduce the dba.

bing said:
My own conclusion on 7 vs 9 blades fan -> HERE

Edit : Those are 38mm fans, thicker means higher pressure.

You should test the 9 blade against a Sunon 7 blade not a Panaflow.

Automata · Oct 31, 2007

CGR said:
I believe they are as stated. Every site that has them list those specs.

That is because no site that sells them tests the specs for validity.

They just put on their site what the manufacturer tells them.

CGR · Oct 31, 2007

thideras said:
That is because no site that sells them tests the specs for validity.

They just put on their site what the manufacturer tells them.

Scythe is a reputable company afaik and I dont think they would put out incorrect data like that.

Buy one and test it if you dont believe it..

Automata · Oct 31, 2007

CGR said:
Buy one and test it if you dont believe it..

I would absolutely love to!!

But sadly I do not have the proper equipment to test it.

Also...each person who tests the product tests it differently. It says x db. At what range? Was it 3cm? Or 5 ft? Or 30 ft?

They never say. Their numbers may be right, but they can twist numbers like I did above

I am not saying that Scythe is a bad company at all, but there is no way those numbers are right without someone twisting them to sound good :beer:

Example: "The Q6600 can run at 4.8ghz"

Under what conditions? Cooled with liquid nitrogen?

They don't give us all the info.

CGR · Oct 31, 2007

thideras said:
I would absolutely love to!!

But sadly I do not have the proper equipment to test it.

Also...each person who tests the product tests it differently. It says x db. At what range? Was it 3cm? Or 5 ft? Or 30 ft?

They never say. Their numbers may be right, but they can twist numbers like I did above

I am not saying that Scythe is a bad company at all, but there is no way those numbers are right without someone twisting them to sound good

Example: "The Q6600 can run at 4.8ghz"

Under what conditions? Cooled with liquid nitrogen?

They don't give us all the info.

Install it in your case, get a dba meter from Radio shack and test the dba at different distances.

meionm · Oct 31, 2007

thideras said:
Also...each person who tests the product tests it differently. It says x db. At what range? Was it 3cm? Or 5 ft? Or 30 ft?

Not only range but ambient noise as well.

There are other problems with fans and noise. Basically moving air will creates noise and can not be avoided. Most folks now look at fans' cfm and noise level and not much often on pressure. Low pressure, high cfm, low noise fan might be good for a case fan but it will poor choice for a heatsink or radiator. Also noise will be different.

Automata · Oct 31, 2007

CGR said:
Install it in your case, get a dba meter from Radio shack and test the dba at different distances.

Ok, you add even more variables with it installed. Is the flow restricted or wide open?

Depends on how much and how accurate the DBA testers are.

If it is 30+ just for the tester, that is hardly worth the money to prove it to someone online. :beer:

No offense. :soda:

Anyone tried these?

Strages

Member

Automata

Destroyer of Empires and Use

Strages

Member

bing

Low Profile Senior

Automata

Destroyer of Empires and Use

Strages

Member

Automata

Destroyer of Empires and Use

bing

Low Profile Senior

CGR

Member

Automata

Destroyer of Empires and Use

CGR

Member

Automata

Destroyer of Empires and Use

CGR

Member

meionm

Member

Automata

Destroyer of Empires and Use

Similar threads