Is it better to have 3 fans bring air into the case and 2 pushing air out, or the opposite?

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BuzzCut_

BuzzCut_

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Sep 15, 2016
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Is it better to have 3 fans bring air into the case and 2 pushing air out, or 2 fans bring air in and 3 bring air out. I could always do 2 and 2. Let me know which one is best. I put 2 in the front bringing in air, 1 in the back pushing air out so far. I just need to decide which direction I should make the overhead fans facing (pushing or pulling).

I'm using these fans:
https://goo.gl/Kjk7u3

and this case:
https://goo.gl/9FnQNi
 
Solution
skit75
Those fans take the cool air pulled into your rig and blow it across the GPU heatsinks. On this GPU, that air is then ported out of the GPU heatsinks, mostly back into your rig and some does leave via the rear exhaust. You actually need those fans to be pointed at the GPU heatsinks to have the continuous airflow across the GPU. If you pointed them the other way, your GPU would most certainly run hotter and throttle itself under load.
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skit75

skit75

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Oct 7, 2008
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As long as you are complimenting the flow of air, it is likely a wash. If I had to choose, I would pull more IN but only if it can be done in an assisting manner. You do not want to disrupt the natural thermodynamic principles. Warmer air rises. So you pull in air from low as possible(front) and exhaust air from high as possible(rear or top). That being said if you are pulling more air than you can exhaust, you could get a turbine effect where the air recirculates in the case a couple times before it gets warm enough to find its way out.

There is no top view in your link so I don't know if you have top case exhaust but the bottom one for the power supply should be used as an intake.
 
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BuzzCut_

BuzzCut_

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There is a top view, there is a metal mesh making it hard to see from the side pictures that amazon provided.
Here is the picture

3zk7QT2mau2KGiWA7

ofrbWDF5J5MvFKmL6


Top View: https://goo.gl/photos/3zk7QT2mau2KGiWA7
Mesh: https://goo.gl/photos/ofrbWDF5J5MvFKmL6
 
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thx1138v2

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Jun 18, 2011
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The object of the exercise is to get heat out of the case so whichever arrangement does that best is what you want. Airflow is also affected by the arrangement of the components in the case as well as the orientation of and number of fans.

You might need to experiment to find what works best with your build. Set it up one way and run it for a few days monitoring the temps reported as well as the ambient temp at the time. Then set it up another way and do the same again. And maybe try a 3rd configuration.

It's the difference between the ambient and the reported temps that you want to look at. Whichever gives you the largest difference is the one to use.

It might seem like a lot of trouble but it will pay off in the summertime when your ambient temps will most likely be higher than they are now.
 
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skit75

skit75

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So thx1138v2 has a valid point. If you load up that top exhaust and those fans are venting the air out before it can cross paths with your components, your cooling configuration won't be nearly as efficient. You want the air to pass over your components so you might have to try a few scenarios to get it just right.
 
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BuzzCut_

BuzzCut_

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I know that this is a completely different question, I'm probably going to have to post a separate thread for but is there a way to make the fans of this video card (https://www.amazon.com/gp/product/B01KVZBNY0?tag=pcpapi-20&pldnSite=1)face upwards? I'm only asking this since people did mention that the hot air would rise better if there were fans blowing cold air from the floor.
 
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skit75

skit75

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Oct 7, 2008
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Those fans take the cool air pulled into your rig and blow it across the GPU heatsinks. On this GPU, that air is then ported out of the GPU heatsinks, mostly back into your rig and some does leave via the rear exhaust. You actually need those fans to be pointed at the GPU heatsinks to have the continuous airflow across the GPU. If you pointed them the other way, your GPU would most certainly run hotter and throttle itself under load.
 
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