Top fans on CPU case - Intake and exhaust together

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crunchedd

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Feb 19, 2016
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Hi, I have built a gaming PC, with the following fan setup:

Front - 2 x Intakes 120mm
Rear - 1 x exhaust 120mm
Bottom - intake from corsair 1000RM PSU.

CPU cooled using Cooler Master hyper 212x.
2 x Asus strix GTX 980 with their own fans and coolers in SLI.


The scenario -
When running the case fans at 100 percent:
During intense gaming, the temperatures of processor are at about 57-62 degs.
The GPU temperatures are maxing out at 77-80.

The case has option for putting fans on the top. I just would like to know what would happen if I put one of the fans intaking air and the other one as exhaust on the top?

Is it good, bad, futile - perhaps it will lead to turbulent airflow in the case?

Any body who has tried this kind of setup, or has any ideas, would really appreciate if you could throw some light on it.

PS: I've searched the forums etc, most of them talk about using both fans on top as either Intakes or exhaust.
 
Solution
coozie7
You don't say exactly which fans are installed, and their quality/airflow varies greatly.

Best setup: Dual intakes, rear exhaust, top rear, exhaust, don't put a top fan above and in front of the Hyper 212, it will increase the CPU temperature by a few degrees (it did so in one of my earlier builds) it seems the CPU cooler fan has difficulty turning the rising airflow through 90 degrees causing the slightly increased temperatures if a top fan is placed above and in front of the CPU cooler.
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nerro120

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Feb 13, 2014
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Either fan would just be fighting each other for air if they are side by side.

Example: one fan is exhausting hot air out, at the same time, the fan beside it is pulling the same hot air back in and vice versa
 
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geofelt

geofelt

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Oct 9, 2006
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I have not tried it, but I vote for futility.

First of all your temperatures are nominal.
GTX980 cards target 80c and run as best they can at that temperature.

If you cpu is amd, your temperatures are a bit hot.
If intel, they are perfectly ok.

I would not increase the exhaust fans. Otherwise, those fans will draw in air that is not filtered by the front intakes, making your pc accumulate dust.

If you really needed to improve airflow, I would replace the two front intakes with higher rpm versions.
But, that comes with added expense and noise.
The intake air will exit someplace, taking the heat with it.
 
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coozie7

coozie7

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Jun 2, 2007
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You don't say exactly which fans are installed, and their quality/airflow varies greatly.

Best setup: Dual intakes, rear exhaust, top rear, exhaust, don't put a top fan above and in front of the Hyper 212, it will increase the CPU temperature by a few degrees (it did so in one of my earlier builds) it seems the CPU cooler fan has difficulty turning the rising airflow through 90 degrees causing the slightly increased temperatures if a top fan is placed above and in front of the CPU cooler.
 
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Solution
H

HikerJon

Honorable
Feb 4, 2014
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10,510


I have two fans in a push/pull setup on the Hyper 212 EVO and 2 exhausts at the top of the case, and I get lower temps with that setup than if I disable that front top or have it as an intake. So maybe in the case of 2 CPU fans the airflow pulled up by that front top fan is able to be utilized. Seems like it for me in any case, well, specifically in my case in this case.

Update: Forgot to mention that I have 2 intakes on the front, one on the side, and an exhaust at the back, along with the top exhausts.
 
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