Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Is NEGATIVE PRESSURE in a Case better? ? ? ?

Is NEGATIVE PRESSURE in a Case better? ? ? ?

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - Is NEGATIVE PRESSURE in a Case better? ? ? ?

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mcstagger   03-31-2008 at 07:16:51 PM

i am adding a side fan to my Antec 900 case that will blow towards my video card.

i am wondering if it is better to keep the case with high exhaust then intake. or if it matters at all.


i ask cause i read something somewhere that mentioned this.

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GeOMan   03-31-2008 at 07:59:35 PM
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Always have more input than output for the simple reason that you need to push air through your PSU. Sure your PSU has a fan but you compromise it's efficiency by having a negative case pressure, that’s why I’d always recommend positive case pressure.

Sure it leads to more dust inside, but a quick blast of air from a compressor/ air gun/ pressurised air can like once a month or even less will sort that out.

I could always have missed some other blinding revelation as to why negative pressure is better and if i have then somebody please correct me.

------------------------------ Rocks are our friends
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endorphines   03-31-2008 at 08:13:18 PM
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I agree with GePMan. but on top of the fan in you power supply being less effective if it's got to fight to pull air out, the same would happen with your video card if it's a dual slot one blowing out like alot of the 8800s or ati 3870. it'll slow the airflow and compromise the cooling of your card.

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RetiredChief   03-31-2008 at 08:26:22 PM
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Balanced is the best
inaddition to PSU, as pointed out, negative means few molecules to remove heat from CPU and GPU. Positive pressure normally increases the temp inside the case. So neg and positive pressure has the same overall effec, but for different reasons.

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The_Blood_Raven   03-31-2008 at 09:20:21 PM
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Generally negative pressure increases cooling performance. endorphines and GeOMan are talking about VERY negative pressure. RetiredChief is the closest, you want close to balanced, though slightly negative is the best, very simple example: (all same fans) 5 exhaust and 4 intake. Positive pressure does not cool better than negative, but too much of both is the worst of all. I find that the 900 with the extra side fan is still slightly negative so it cools very well.


Message edited by The_Blood_Raven on 03-31-2008 at 09:21:33 PM
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mcstagger   04-01-2008 at 09:51:48 PM
- 0 +

ok, alright, i feel pretty satisfied with the response im getting.

thanks for the input. i'm looking forward to getting my new fan and fan controller install this evening.


take it easy
-McStagger

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