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positive pressure cooling question

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July 6, 2014 8:14:13 AM

I have a newbie question about cooling and was hoping for a little help. From what I have read I think I want positive pressure. I currently have a HAF XB EVO case with Noctua dh14 cpu cooler as well as a Noctua NF S-12A PWM 120mm fan for exhaust. I have the two stock 120mm Xtra flow fans for intake and the power supply I will be using is the CoolerMaster V850. I could not find fan cpms for the power supply, but maybe I just didn't look hard enough. Is it even possible to get positive pressure in my case?

Any help would be great.

Any thoughts on two 80mm fans for the lower compartment for my hard drives/ power supply.


Still shopping for a gpu, but I'm looking at the EVGA GeForce GTX 780 3GB Dual FTW ACX Video Card.

Let me know if more info is needed.

Thanks in advance.
a b ) Power supply
July 6, 2014 8:21:14 AM

Ok first off why do u want positive pressure? when i was setting up my case fans almost everything i read said negative pressure is better for cooling.
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a b ) Power supply
July 6, 2014 8:34:34 AM

Dunlop0078 said:
Ok first off why do u want positive pressure? when i was setting up my case fans almost everything i read said negative pressure is better for cooling.


not really... it depends on the case really... if you have a case with poor natural airflow, then yes, negative pressure is a better setup. many all mesh cases suffer from poor natural airflow, natural airflow cases are those that are designed with natural convection in mind. they might have the motherboard rotated 90 degrees, or have nice open spaces (inside the case), strong top venting exhaust, some fans on the bottom of the case pointing up to aid convection.

If you have a case with strong natural convection, you probably are better off with a possitive pressure setup. a case with poor natural airflow might benefit SLIGHTLY more from negative pressure. Poor cooling cases (which is different from poor natural airflow) will be pretty much equal either way.

The big advantage going with positive pressure, no matter what the case design is it keeps dust out of your computer. especially if you have good screens in front of the intakes. Negative airflow cases suck dust into the case from every crack... they get dust around the screens. Here in phoenix, where there is dust EVERYWHERE, as is the case in any dry climate, it's a big enough deal to stay away from negative pressure at all cost.



Now, onto the OP's question

-That case is basically a benching case. i'd get whatever high airflow fans you want that will meet your noise and airflow needs. with all that open space you really don't need to worry about venting... just keeping the air moving in the same direction (don't mount fans pointing at each-other... make sure the airflow all goes the same direction)
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July 6, 2014 11:39:04 AM

Dunlop0078 said:
Ok first off why do u want positive pressure? when i was setting up my case fans almost everything i read said negative pressure is better for cooling.


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July 6, 2014 11:41:12 AM

I read that with positive pressure the air flow goes out the cracks and crevices in the case, but with negative pressure it sucks in dust through all cracks and crevices.

Is that not accurate??
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a b ) Power supply
July 6, 2014 2:13:53 PM

jonroberts26 said:
I read that with positive pressure the air flow goes out the cracks and crevices in the case, but with negative pressure it sucks in dust through all cracks and crevices.

Is that not accurate??


that's 100% accurate.
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July 6, 2014 8:02:03 PM

ingtar33 said:
jonroberts26 said:
I read that with positive pressure the air flow goes out the cracks and crevices in the case, but with negative pressure it sucks in dust through all cracks and crevices.

Is that not accurate??


that's 100% accurate.


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July 6, 2014 8:09:25 PM

So as long as I have the two intake fans blowing at the cpu cooler and the cooler blowing at the back of the case and the exhaust fan blowing out the back of the case (all the same direction) I will be good?

That is the setup I figured to go with but was unsure about the in vs out cfm totals. Also any thoughts on the 2 80mms on the bottom of the case. As of now I only have a SSD in my planned system, but I'm sure a HDD is going to be in there eventually.

Thank you for the confirmations so far.

I was excited about the giant 200mm fan on the top of the case at first for exhaust, but than found out that it won't fit with my huge cooler and it doesn't make that big of a difference.(temp wise)
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a b ) Power supply
July 6, 2014 9:30:02 PM

yep.

as long as the air flows in the same direction you're all good. besides as i said, this is mostly a test bench... so i suspect that big giant fan spot on the top of the case is actually designed to be an intake... like any good test bench setup... lots of airflow DOWN onto the board.

That said you easily could use it as an exhaust if you wish.
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