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Positive vs. Negative Airflow - Page 3

post #21 of 43
Antec 1200 on the backup says "WHAT!"
    
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post #22 of 43
I do whatever works best for my watercooling. Therefore I have 6 fans on my radiator (three scythe ultra kaze pushing and three medium speed yate loons pulling) along with one 140mm fan on the bottom for intake. That's about it
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post #23 of 43
i run positive.

2x140, 1x120mm intakes and 1x120mm exhaust. which may seem unbalanced but my case has good ventilation holes on the rear, so all the extra air that the exhaust fan (and gpu) cannot push out just gets pushed out by the positive pressure.

just like at a fire scene. we use positive pressure ventilation. just the best way to do it.
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post #24 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....

this. if you live in an igloo positive is better, if you live somewhere normal negative is better.
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post #25 of 43
Quote:
Originally Posted by F-U-B-A-R;12736298 
I believe in POSITIVE! (Or at least I think this is positive tongue.gif) My Airflow.
It's actually more negative unless you have some real power pushers in the front.
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post #26 of 43
Quote:
Originally Posted by CoRuPt;12736470 
this. if you live in an igloo positive is better, if you live somewhere normal negative is better.

Well I agree to a degree, however, my room ranges between 17 degrees, and 27 degrees at it's hottest. On my GTX 470 with the VF3000F cooler, depending on the temperatures in my room has the same 10 degree difference "idle" occasionally goes even higher, a few weeks back my temperatures were 33 degrees idle, now they're at 44 degrees idle, which is a fair difference but never gets hotter than 70 degrees.

Now, I have positive flow in my case, as it utilises the [ame="http://www.youtube.com/watch?v=douRh490E3I"]stacking effect[/ame] when my room is at 27 degrees, I'm pumping the hotter air in, thus my temperatures increase.

If I were to be effectively sucking that air out, reversing the fans to exhaust instead, (which I haven't tested), I'm assuming either one of two things will happen:
  1. Fans won't be as powerful, and will not be able to cope with sucking air out of the case as well as they do with blowing it upwards, thus temperatures will increase!
  2. This is very unlikely to happen, but if the fans were able to move vast amounts of air out of the rear of the case (which if it's hot, it will just rise anyway), the temperatures would decrease (impossible to achieve with my case and probably the most pointless thing I have ever said).

To conclude, in normal environmental situations, I'd suggest positive airflow depending on your case. I wonder how long it will take before companies start making fridge cases more accessible to the public as it's not exactly easy to get hold of haha!

Could just mod one I suppose, would that even work? Hmmm...

Another afterthought, you guys have obviously heard of oil cooling, what do you think of that? Other than totally not worth it.
    
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post #27 of 43
I prefer reverse positive airflow since it keeps my CPU the coldest. GPU is another story though :\
Edited by Skylit - 3/15/11 at 6:19am
post #28 of 43
I have had both negative and positive. I am now sold on Positive and Silverstone has done an excellent job with their positive airflows. I can't really see any major stall points except maybe between the hdd and the dvd-burner, the entire top of the case is ventilated not to mention the 1 exhaust fan.
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post #29 of 43
I roll with an "open airflow" policy on my rig biggrin.gif

DSC00351.jpg
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post #30 of 43
I say it is dependent upon the number of case fans. If you have a low amount of case fans (1-2), negative pressure is better. If you have a lot of case fans, positive air pressure is better.
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