Can you stack two cpu fans on each other?

[youppi]

I have an slk-947u on a 2600+ mobile. I have 2 92mm fans. can i somehow stack the two to increase cfm. Is this bad? Lemme know. thanks

 

[hypn0tik]

"You can drive a car with your feet but it doesn't make it a good fvcking idea." - Chris Rock

 

[SVT Cobra]

yes you can, but it would be stupid

it would be better off to place it in another area...you would see a better benefit in cooling and CFM

btw

WRONG FORUM

 

[jlee]

http://forums.anandtech.com/categories.aspx?catid=28&flcache=1591284&entercat=y
CPU/Processors & cooling..

 

[FoBoT]

what hypn0tik said

find something else to do instead

 

[T3C]

They would be fighting against each other. no good

 

[mindmaniac]

Yes, there is nothing stopping you. However, CPU cooling can be greatly helped if you have proper ventilation throughout the computer. Meaning have a fan on one side sucking in air, and one on the other side pushing the air out. If this is done one to one in power even the stock CPU fan will greatly reduce temps. Hope that helped.

 

[quakefiend420]

something else to think about is to make a duct to pull in outside air straight to the cpu fan...that will help out a lot...when i was on air cooling it dropped my idle temp from 47C to about 42...i just made on out of cardboard and ran it from my side fan...pretty easy for what you get from it

 

[Biggerhammer]

As I've read, this will increase fan power but not by anything close to double. I understand that it doesn't change the CFM rating of the fans but it does increase the power of them, so they will come closer to that ideal CFM number in the real world.

 

[Hottie]

Originally posted by: TechITguy
They would be fighting against each other. no good

IBM will tell you that's is not always the case, some of the IBM X server have stacking fan.

 

[mooncancook]

hmm... interesting. If you have two fans stacked together blowing at the same direction... we know if we blow at a stand-still fan the fan would spin. So the fan blowing at the other fan would help it spin faster. if it spins faster it would draw more air, therefore helping the other fan spin faster too. So my guess it that it would help. but i think this needs to go to the highly technical forum.

 

[suszterpatt]

Originally posted by: mooncancook
hmm... interesting. If you have two fans stacked together blowing at the same direction... we know if we blow at a stand-still fan the fan would spin. So the fan blowing at the other fan would help it spin faster. if it spins faster it would draw more air, therefore helping the other fan spin faster too. So my guess it that it would help. but i think this needs to go to the highly technical forum.

The benefit from the other fan's airflow is marginal when compared to the force of the motor.

 

[JEDIYoda]

Originally posted by: Biggerhammer
As I've read, this will increase fan power but not by anything close to double. I understand that it doesn't change the CFM rating of the fans but it does increase the power of them, so they will come closer to that ideal CFM number in the real world.

Not a good idea!!

The disadvantages out weigh the advantages!!

 

[mindwreck]

Originally posted by: JEDIYoda

Originally posted by: Biggerhammer
As I've read, this will increase fan power but not by anything close to double. I understand that it doesn't change the CFM rating of the fans but it does increase the power of them, so they will come closer to that ideal CFM number in the real world.

Not a good idea!!

The disadvantages out weigh the advantages!!

yeah it does help with pressure but it increases the noise greatly

 

[suszterpatt]

That's true too. Two unsync'd fans can create a lot of turbulence and vibration.

 

[Lemec]

"You can drive a car with your feet but it doesn't make it a good fvcking idea." - Chris Rock

:thumbsdown:

I signed up just to answer you. Usually people try to show how intelligent they are, not the opposite. For a proper answer, check this:
http://www.comairrotron.com/airflow_note.shtml

 

[Lemec]

I have an slk-947u on a 2600+ mobile. I have 2 92mm fans. can i somehow stack the two to increase cfm. Is this bad? Lemme know. thanks

Go to
http://www.comairrotron.com/airflow_note.shtml

 

[0roo0roo]

it increases static pressure only. double cfm doesn't happen. to do that you'd need to use the fans in parallel, side by side or such. at best it will approach the max of a single fan, but interactions might mess with that. unless its trying to force air through layers of heatsinks there is not advantage, just more noise.