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Fan for the graphic card "disrupting" air flow?

post #1 of 13
Thread Starter 
A friend recently read that a fan blowing air on the graphic cards can disrupt the air flow, actually causing the cards to get even hotter instead of getting cooler.

Since my HAF-X has a fan + some kind of "tunnel" thing to force the air over the graphic cards, I'm curious if he is correct or not.
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post #2 of 13
Depends on where the GPU is exausting.
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post #3 of 13
Thread Starter 
Ah. Hmm... I have Gigabyte cards, two fans on the side. I assume those are intake fans, and that they exhaust the air on the back of the case.

I guess I can try the temps with and without the tunnel thingie. Intuitively it feels like it should help with the cooling, especially since I have a big fan in front of the case feeding the smaller "tunnel fan", but I have also got the impression that air flows can be... weird.
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post #4 of 13
it really depends... typically speaking, the static pressure of a GPU fan is FAR higher then a case fan so the cooling is still being done by the GPU fan. there would be more of a problem of hot air recirculation then air pressure competition between the GPU fan and the case fan.
post #5 of 13
Keep the fan blowing on the GPUs. It is feeding them cool air and keeping them from reusing hot air in the case.
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post #6 of 13
Quote:
Originally Posted by psyclum;15186939 
it really depends... typically speaking, the static pressure of a GPU fan is FAR higher then a case fan so the cooling is still being done by the GPU fan. there would be more of a problem of hot air recirculation then air pressure competition between the GPU fan and the case fan.

This +1. GPU fans tend to be 3000+ RPM and are right over their target area. Unless you have some kind of Delta Leafblower Nightmare case fan mounted over that area, I don't think a case fan could prevent the GPU fan from doing its job, and even then, such a monstrous fan would only help by cooling your entire system. cool.gif
post #7 of 13
Quote:
Originally Posted by Dorkseid;15188012 
This +1. GPU fans tend to be 3000+ RPM and are right over their target area. Unless you have some kind of Delta Leafblower Nightmare case fan mounted over that area, I don't think a case fan could prevent the GPU fan from doing its job, and even then, such a monstrous fan would only help by cooling your entire system. cool.gif

hehe if you have a delta fan blowing on your gpu, you can run the damn card fanless. 200+ CFM fan = complete overkill for consumer grade computer:D
post #8 of 13
Quote:
Originally Posted by psyclum;15188079 
hehe if you have a delta fan blowing on your gpu, you can run the damn card fanless. 200+ CFM fan = complete overkill for consumer grade computer:D

Tried it. The noise was too much, even with headphones. Plus the dust filter would fill up in about an hour. rolleyes.gif

Back on point though, the side case fan's purpose is to give the GPU fan more cool air to use in cooling the card. Plus, they can give the total case airflow more directionality and help prevent the hot air re-circulation problem, so long as there's good exhaust as well (up top).
post #9 of 13
Technically, turbulence in airflow leads to improved cooling. It also leads to more noise. If you have any half-decent airflow scheme (read: more than one low-power, filtered intake fan), you shouldn't be worrying about exhaust air being recycled.
    
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post #10 of 13
Thread Starter 
I see. I did find it a bit strange that a "high-end" manufacturer that has been around for a while, and that clearly is appreciated by the consumers, would mess up the fan stuff.
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