#264 – Q&A: Positive or Negative Pressure (Computer Case)
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Cool video about Computer Case, take a look:
Isn’t negative pressure better for case cooling? Or is it case specific? I’d like to hear your opinion. I would think an equilibrium would be best. Do a demonstration on how to test what is best. Thanx Gameman
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Comments
I have an antec p183 set up with negative pressure. When i set the fans up to have positive pressure the temps tend to be a little higher because, i think, the cpu fan is recycling more warm air rather than having a fresh supply of air. I really see a jump in mobo temps as well when the case has a positive pressure. Just my experience
you want the intake and exhaust pressure to be exactly the same. Positive air pressure does you absolutely no good
Would you say that all those cracks on the back of most cases reduce airflow?
What I’m thinking is that cool air should only come from the front of the case and then you would have fans in the back exhausting and no crack anywhere
Ati Ftw!
Completely wrong. Positive pressure reduces air flow, heat dissipation is decreased as air can be more stagnant.
Furthermore unless you know your air intake fans serve as a much better filter than the tiny cracks in your case, dust intake probably isn’t any better either.
would you recommend switching the top fans on a coolermaster atcs 840, so you can get positive airflow? because i believe the fans are pushing air out now in.
at least tell me what it is what is a weather system?
anyway positive pressure is better foe example its like this its better to have 2 thirds of positive and the other negative for a optimal and perfect airflow dont u think?
Google is a friend.
ok “noob pro” mind telling me what a weather system is then?
u typed “lrn spaling” before like that was your dads name XD
ok what the hell is a weather system im sure that is not a machine there is no machine capable to altering weather
You called me “noob.” I believe that is an insult.
I told you to “lrn spaling” (learn spelling). lrn spaling isn’t a person.
You replied to gasdacia earlier about the office fan thing being silly and how you didn’t know what a weather system was.
im not insulting but im really beginningto doubt ur intelligence coz ur speaking random stuff
“n noob Irn spaling b4 insult ppl”??? i dont get that sentence at all who is Irn spaling and who is “gasdacia”??? and please this time be specific
I was giving an example of a weather system, and one that gasdacia was talking about. n noob lrn spaling b4 inslt ppl.
what are u even talking about??? noob
the point of this video is if u have enough fans positive pressure is alwayz better examply if u have 5 fans put 3 for positive 2 for negative that way its excellent airflow
Cold fronts are low pressure systems going to high.
Dust filters don’t stop dust completely…they merely catch most of it
I’ve got dust filters on every intake fan on my case and I clean them very regularly…yet I still get dust in my case (which I clean once a month with an air duster)
What about dust filters?
negative flow will result in a lower ambient case temperature but unfortunatly thats not what we really need.
For cooling the critical components such as the CPU, GPU, MB and RAM, I would say positive airflow is more effective, and avoids a heavy dust build up at the same time.
well thats true but truth is heatsinks dont technically come in that many different designs most have fins and when u blow air in its gonna be exhausted through the sides and besides blowing air in is the way to go if ur actually cooling something important like a processor since the processor will mostly be under the heatsink blowing air in is the way to go. that office fan thing is silly everyone knows that. weather systems??? i dont know what that is
It actually depends on the shape of the heatsink itself, but yeah in a lot of cases that’s true
However, if you were to have a SFF case a low profile cooler would be needed and a lot of those cases are best off with an exhaust over the top as this creates negative pressure that cools down the whole of the case
Try this…put your hand behind an office desk fan…it’s cold because of negative pressure
The same applies to weather systems…with low pressure dominating it’s cold etc
heatsink fans that draw away air from heat sinks are full of shit compared to things that blow air in coz fans that blow air in exhaust air at the same time through the fins
My case (3DAurora) only has 1 intake fan, but it has 2 exhaust fans.
Actually I know of a lot of HSFs that draw air away from the HS itself…a lot of low profile CPU fans do this in fact
I have the antec 900 which has the internal “wind-chamber” pointed directly at the GPU…i tested the temperatures of the GPU with the fan both intaking air and exhausting air and believe it or not it’s 3 degrees cooler with the side panel fan exhausting air
Trust me I know a lot about air flow…hence my CPU fan is pointed upwards so the heat goes out through the top 200mm fan
The side fan is to bring in cool air to the gfx card – same principle as having the fan on top of a heatsink, it’s positioned to blow air on to the sink, not draw air off. Any case that has a side fan will have it pulling air in. The direction is important. You’ll get better airflow with in at the front and out at the back than you will with in at the front out at the top. Having said that you’re right hot air does rise, so it’s also good to have at least one fan exhausting out at the top.
I would disagree on some level
I have 2 intake fans and 3 exhausts, however they are configurated in way of heat flow
As everyone knows…heat rises as a rule, therefore all my exhausts are at the top of the case to aid this upward flow (except one of the exhausts which is on the side window to aid the exhausting of heat from the graphics cards)
Also…if you’re concerned about dust getting into the case through holes…plug them up…you can get blanking brackets for expansion bays very easily
In the airplane industry we call it constant Flow!