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Positive vs. Negative Airflow - Page 4

post #31 of 43
Quote:
Originally Posted by Roxborough;12725653 
I'd rather put pins in my eyes than have an airflow debate.

It literally depends on your ambient temperatures... if your ambient is higher, you want to be sucking air out of the case, if you have a lower ambient, you want to be sucking air into the case....

Can you explain how it is possible that your ambient is going to be higher than inside your case short of using phase change cooling of the air in your case?

another thing that can be a drawback to negative pressure is that the dust is more than just unsightly, as it builds up on things like coolers, their efficiency drops.
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post #32 of 43
^^ good point. Also Negative air prssure will cause your case to get dust building up in all kinds of weird places where air can get in. At least with positive the dust will be only where the fans are biggrin.gif
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post #33 of 43
Quote:
Originally Posted by TickleMeElmo;12736034 
Something that doesn't get brought up a lot but is very important in case air flow is how much air the GPU(s) dump out of the case. Furthermore, the fans on most modern GPUs are temperature dependent, so a case that has positive pressure could end up having neutral pressure under load.

This is why I have intake fans in the lower part of my case. It is also why I leave most of my backplane slots uncovered: the open slots promote air warmed by the gpu to leave the case under the influence of pusher fans.
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post #34 of 43
Quote:
Originally Posted by Phobos223;12744025 
^^ good point. Also Negative air prssure will cause your case to get dust building up in all kinds of weird places where air can get in. At least with positive the dust will be only where the fans are biggrin.gif

The ease of filtering/cleaning is all the reasoning I'll ever need to stick with positive pressure.

I filter the intake and clean it once a month. That's all it takes, and you just can't beat having a perfectly clean heatsink/GPU after years of use... I'd bet the fact that they are not coated in dust makes up for any (possible) loss of cooling efficiency using positive pressure.
    
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post #35 of 43
Quote:
Originally Posted by Roxborough;12739290 
stacking effect
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post #36 of 43
Positive all the way.

A heatsink or component runs much cooler with fresh air blowing directly at it - as long as there is sufficient exhaust (2-3 exhaust fans) the warm air wont remain trapped inside allowing more fresh air to enter.

Having said that, you can't have too much airflow. As long as the amount of air going out isn't too far off from the amount of air coming in, sky is the limit.


As for the stack effect, good in theory but not perfect. A fan under performs when it's drawing air in and the front of it is really close to a surface and also has to pull air in through a mesh and a filter.

If you had a case suspended off the floor and the fans were free flowing, it would work great.
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post #37 of 43
One thing about positive pressure I haven't seen anyone mention yet, although I may have missed it:

Case fans flow only so much air at a given pressure. Feed a little more pressure to them, and they will spin faster, and move more air. Has anyone noticed on a dual fan heatsink, in a push/pull setup, how the puller is spinning faster than the pusher? The positive pressure will do this even in the terms of the entire case, although it is possible for a very high powered CPU fan, on a pancake style heatsink to fight case fans.

For me, I still like having the fans turned up, and knowing that even my fan controller has plenty of airflow moving around it, out the front of the case, although the thing never did run very warm (30C at most).
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post #38 of 43
Well they say negative airflow adds more dust but I use a dust filter and I have more negative than positive so I get the best of two worlds.
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post #39 of 43
I tried negative, as my case was slightly that way out of the box. I tried fan filters (aluminum mesh, and foam). I was cleaning them once a week at least (usually 2-3 days before they clogged). On top of that, I still had to clean the CPU heatsink once every 3-4 months. I switched to positive, and (prior to recently going with water), I cleaned the CPU heatsink once in a year, and it was barely dusty. The filters are still in place, and need to be cleaned about once a month now. Go figure on that one, I'd expect no difference on filters.
As for case temps, I noticed lower ones with positive pressure, although I was using more fans to achieve that (4x92mm at that time). I will at least say the Chieftec Mesh full tower is an excellent blank canvas, although I probably should've gone with 120mm intake fans, but felt the 92mm would provide better pressure.
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post #40 of 43
I dont really care. I just let Lian Li decide and then use it.
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