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BlisterDick
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Optimal air flow for PC case

Sup [M]? I was hoping you could help me out with the fan setup in my case. I've got an 80mm fan in the back pulling air out, an 80mm on the side pulling air out, another 80mm on the side pulling air in and towards the PCI-e graphics slot, PCI slots, and CPU, and finally a 120mm fan in the front which is pulling air in from the outside (I think - when I put my hand over it I feel air coming out but very lightly, so I'm assuming it's facing inside and actually pulling air in). Also, I have a CPU fan/heatsink.

This is the way the case was setup when I purchased it. A couple of months ago I noticed the CPU was running much hotter than it had ever ran before. It used to run between 28C and 40C max, now I'm getting readings of 55C to 62C. Checked the exit fan in the back and it was broken. Bought a new one and realized I didn't know which way it should face - pulling cool air in or exhausting hot air.

If the front 120mm is pulling in cool air and the back 80mm is exhausting hot air than this should work, right? This is what I've got going but my temps are way too high.

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Old 05-31-2008, 05:44 PM BlisterDick is online now  
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Radeky
 
double check that the 120 is exhaust or inhale.

You want more air exiting the case than entering, however is best to set that up.

The idea is that if the fans need to pull more air, they can pull it from the ambient around the case through all the holes, etc. But if air can't get out fast enough, it stagnates and heats up inside the case.
Old 05-31-2008, 06:15 PM Radeky is offline  
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matt00926
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Back fans should exhaust; front and side fans should be intake
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Old 05-31-2008, 06:33 PM matt00926 is offline  
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Back fans should exhaust; front and side fans should be intake
That's what I always thought. Front and side in, back and top out.
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Old 05-31-2008, 06:44 PM Cloud 69 is offline  
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Rear is exhaust. Turning off those side fans might even help things... they disrupt the front-to-rear flow.
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Old 05-31-2008, 06:57 PM :ninja: is offline  
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zro
 
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Originally Posted by Radeky View Post
double check that the 120 is exhaust or inhale.

You want more air exiting the case than entering, however is best to set that up.

The idea is that if the fans need to pull more air, they can pull it from the ambient around the case through all the holes, etc. But if air can't get out fast enough, it stagnates and heats up inside the case.
I bet that increases dust accumulation inside the case, though.
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Old 05-31-2008, 08:43 PM zro is offline  
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Radeky
 
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I bet that increases dust accumulation inside the case, though.

Possibly, thats what filters and canned air is for though.
Old 05-31-2008, 11:06 PM Radeky is offline  
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phez
 
Please - do not forget about the PSU.

Many modern machines will atleast 2x120 rear exhaust, just because of the addition of the PSU into the equation. But the concept of the exhaust pressure is correct - atleast in antec's eyes, providing 2x92mm in the front of my solo.
Old 05-31-2008, 11:47 PM phez is offline  
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prometheum
 
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its not that complicated, the upper back back is where the hottest components are (video card and cpu) do you want that hot air have to work its way throughout your case?
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Old 06-01-2008, 12:49 AM prometheum is offline  
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zro
 
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Possibly, thats what filters and canned air is for though.
Filters won't catch dust being sucked through every crack when exhaust flow > intake flow.
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Old 06-01-2008, 08:43 AM zro is offline  
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Always intake on top of the CPU fan. It looks like it's sucking out, creating a relative low-pressure zone over your CPU. That is if your CPU is roughly under that top side grill.
Old 06-01-2008, 08:55 AM Perry County is offline  
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flshdncr
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You probably need to blow the dust out of your CPU heatsink and other areas. Also, check your cabling to make sure it's not blocking air. ATX calls for air to flow from bottom front to top rear.

Lastly, did you replace your rear fan with one that moves the same volume of air? You may want to buy a better rear fan.

Quote:
Originally Posted by BlisterDick View Post

If the front 120mm is pulling in cool air and the back 80mm is exhausting hot air than this should work, right? This is what I've got going but my temps are way too high.
Old 06-01-2008, 09:12 AM flshdncr is offline  
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Radeky
 
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Filters won't catch dust being sucked through every crack when exhaust flow > intake flow.


Take the tradeoff. If you live in a low dust environment, then you're fine. But if you live in a shitty residence hall and never sweep or vacuum, then you're fucked. its all up to you.
Old 06-01-2008, 12:43 PM Radeky is offline  
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