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Can putting two fans next to each other actually reduce airflow?

post #1 of 8
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Can putting two fans next to each other actually reduce airflow?

Just for the hell of it, I jury rigged this system in my case earlier today:



However, with it, I've seen the primary GPU idle 2C lower than before it was there, but the third card idles 2C higher than it used to.

What?
post #2 of 8
The only way I see this happening is if one fan is spinning much slower than the other.
 
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post #3 of 8
well i did this once and i found no difference in air flow..just more fan noise.
    
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post #4 of 8
I actually played around with putting fans together. Usually I get a significant drop in output. I do have a Papst that runs clockwise instead of the normal counterclockwise. Putting it with the right normal fan can increase output. OTOH, putting an Arctic Cooling clockwise fan with a normal fan did nothing.

Again, with two counterclockwise fans, throughput went down. That's my experience. YMMV. Try it for yourself.
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post #5 of 8
Yes. Airflow will drop because all its doing is creating a bunch of turbulence.
    
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post #6 of 8
as long as the fans are equal rpms i don's see a problem.
post #7 of 8
I do not think so as long as they are moving around the same amount of air.
 
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Gsvlip Dudyrm
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Oda'maksv
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post #8 of 8
You guys really need to try it out: run a Molex extension from you PSU and plug two fans into it. Then slide one fan in front of the other and feel the output.
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alpha updated
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secundus
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