grossebeaver

Keeping a slight positive pressure in a case helps to keep dust accumulation down, if it's a concern (assuming you have some kind of filtering coming in).

Texican

I truly believe that having a negative pressure is best for removing hot air in the case.
True life example. I work in the construction industry where sometimes we have to enter vessels or tanks that have been emptied of gases that are hazardous. In the old days, we would force air into the vessels to clear out any gasses but it turned out that often the gases would stay in a pocket which made it dangerous and deadly for the entrants. The construction industry has now switched to using a negative pressure which truly removes all the gases and gives no chance for any "hot" spots to remain. Thus, better air movement. Just my two cents.

USFORCES

Air cooling I guess negative would be better, bad thing is you get more dust build up and that will cause your temps to rise unless you clean it on a regular basis.

But if your water-cooling Positive pressure is the only way to go it keeps dust from coming in all the cracks, I only have one filtered 120mm for intake, but everything in my case is water-cooled the inside of my case looks as clean as the day I bought it over a year ago I just have to change the filter every couple months.

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nub

Does the case have a top mounted blow hole type exhaust fan? If not, you should consider putting one in.

slothfish

Yeah it in the diagram, blows about 40 CFM. So the unanimous vote for cooling is negative pressure? Anybody have an opinion on where I should place my fans (refer to crappy diagram)?

neobloodline

Just make sure the air movement makes sense. Cool air flowing in from one direction and blowing around and across hot components and swarming out towards another direction where the warm air isn't going to contact much. If you have intakes and exhausts fighting the flow of each other you may as well start over. A fully open case isn't necessarily better. I agree with the positive pressure view. In from one point and out from the opposite will make a flowing stream and there won't be time or space for hot air to build up inside.

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slothfish

But positive pressure is when you have more air coming in then you do going out, do you mean negative pressure?

noodle

i thought you were meant to have the intake fans higher than the out-takes, eg medium on the intakes and low on the exhaust ones

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slothfish

Well my case originally only had 2 fans, both exhaust. I am planning on modding my case to have these extra fans, so I am getting people's opinions. I've decided to switch the top right intake fan to an exhaust fan, what do you guys think?

noodle

when you say top intake do you mean its on the top of the case? if so make it an exhaust fan as hot air rises

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15.1k 3dmark6 on vista
4ghz E8400 100% stable