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Top Exhuast vs Top Intake - Page 5

Poll Results: Which one is better?

 
  • 14% (21)
    Top Intake
  • 85% (127)
    Top Exhaust
148 Total Votes  
post #41 of 59
Again, I have to say, a poll asking "Top fan: Intake or Exhaust" is no good. It depends on a lot of other factors not least of which is the position of the heatsink. People who vote exhaust because "heat rises" are missing the whole point of case fans and should do some reading to educate themselves. If you have enough fans in the right position, the warm air doesn't get a chance to "rise", it goes where it's pushed.
post #42 of 59
Even better: each user should run his or her own tests. That's what turned me around.
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post #43 of 59
Quote:
Originally Posted by ehume View Post
Even better: each user should run his or her own tests. That's what turned me around.
Exactly. Just because because a particular fan placement works best for one person doesn't mean it's best for everyone
post #44 of 59
If your case has high powered fans, top intake is probably better for CPU temps. Convection won't really be a huge factor considering how much airflow you have. If your case only has a few slow spinning fans, top exhaust is probably better since convection will be more of a factor.
post #45 of 59
Two bottom intake, two top exhaust is ideal for me. heat rises, and the graphics card's fan inhales from the bottom area of the case, so this provides it with a decent amount of cool air
post #46 of 59
Quote:
Originally Posted by ehume View Post
Even better: each user should run his or her own tests. That's what turned me around.
Listen to this guy, I mean, seriously just read his title . . . .

How else do you think Air go in his title? He KNOWS what he is talking about. .

He also would appear to have spent ALOT of time running AIR COOLING experiments for the benefit of the rest of us OCN users. . Check his SIG
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post #47 of 59
Hot air rises.
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post #48 of 59
Hot air does rise, but it's air and that can be directed.
post #49 of 59
Latest intel linpack libraries ran 30 minutes
Ambient temp: 32 C

Top exhaust
Average load temp: 81.75 C
Temp delta: 49.75 C
Max load CPU temp: 82.25 C
Max temp delta: 50.25 C



Top intake
Average load temp: 80.75 C
Temp delta: 48.75 C
Average max load CPU temp: 82 C
Max temp delta: 50 C



Ignore the idle temps. Computer was not at idle when idle temps were recorded.

As you can see, top intake was marginally cooler. Basically, top intake has the same performance as top exhaust. Top exhaust or top intake does not really matter in my computer case. It may be different for your case.
Edited by Riou - 7/5/11 at 6:09am
post #50 of 59
Quote:
Originally Posted by kora04 View Post
Hot air rises.
No, hot air goes where it's blown.

A 55CFM 120mm fan (ie low speed NF-P12) has air velocity of ~2.3m/s, but the even fully unobstructed air heated from 20C to 40C over a distance of 20cm (half an ATX board or so, which is reasonable for the case sizes involved) will naturally reach a speed of just 0.25m/s due to convection. The convection is irrelevant even for this low speed fan.

One scenario that is missed off the poll (and my favourite generally) is to have the top vents sealed completely, with no fans in place at all. Same with side panels - seal the vents completely. Instead use free 5.25" bays for front air intake in addition to the lower intakes usually used, and rear exhausts. This means you have all the air flowing front to back nicely, with no costly changes of direction or bloackages in the flow due to GPUs etc (which result in lost energy & increased noise).

Quote:
Originally Posted by joemunky View Post
Two bottom intake, two top exhaust is ideal for me. heat rises, and the graphics card's fan inhales from the bottom area of the case, so this provides it with a decent amount of cool air
Except for the fact that your GPU(s) get in the way, blocking your airflow and meaning your fans have to work much harder than they should in order to push the air around them. You want nice unobstructed flow wherever possible - and so on a mobo that means front to back, across the face of the GPU not straight at it head on.
Edited by the_beast - 7/5/11 at 2:34am
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