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Positive Case Air Pressure and nVidia Card Cooling

post #1 of 4
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Alright: Someone please gimme the skinny on this. I have seen a number of different posts all over OCN talking about positive and negative air pressure in cases. I have also seen a number that comment about nVidia cards preferring positive pressure.

My assumption is that if you have positive pressure in your case, with your card(s) being the sole point of air exhast, you will get better performance from your stock cooler.

Personally, I am not overly fond of the stock 580 cooler, no matter what the hype has been about it being "better". The fan still sounds just as loud when it is running at 80 - 100% as all of the other cards with that sort of cooling fan, and I prefer a cool card. Granted, the 580 cooler, with the fan @ 100% keeps the card at around 50+* under load, but it is still a noisy SOB.

Right now, I am running at pretty much equalized pressure, or MAYBE slighly negative pressure in my case, given the number of intake fans, and their respective speeds/cfm and my exhast fans (given the same variables).

Can I accurately assume that increasing my positive pressure can/would improve my cooling efficiency with the stock cooler? Furthermore, does that same principle apply to other coolers such as the AXP (I wouldn't think so, based upon my experience with the AXP on my 480s. I found that the AXP tended to blow the heat around the inside of my case, rather than directly out the back like the stock cooler.)

I like cool running temps (makes ME feel all warm & fuzzy inside to see the machine running cool). For that reason alone, I am exploring my options and considering going to AXP's for my SLI 580's, or a WB solution that will cover everything, including my CPU, GPUs, and chipset.

I look forward to your comments!
Timberwolf
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Timberwolf
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post #2 of 4
I run a slightly positive pressure setup. 2x 140mm yateloons ~500rpm intake, 1x 120mm yateloon ~800rpm exhaust. I tried cranking both intakes up to full speed (1400rpm I think) and it didn't make a bit of difference.
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Derptron 9000
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post #3 of 4

I've been wondering about positive are pressure as well. As far as I can tell, the difference between positive air pressure and negative air pressure is whether the top fan is intake/exhaust. and while the difference between the two is probably negligible, I feel that a positive air pressure case would work better for video card cooling and if you have a cpu cooler like the hd50/70.


it might not make a big difference in temps, but it supposedly helps a lot with keeping dust out of your case.
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post #4 of 4
One thing that is better about positive pressure is that air that is exhausted from the expansion ports isnt pulled back in on vented expansion port slots and/or case vents in that general area.

For instance, with my case, which happens to be a negative pressure setup, if you hold a piece of napkin or tissue paper in front of the expansion slots, it will be sucked into them. My expansion slots are vented however.

My case comes with an auxilary expansion bay exhaust duct with a fan for this purpose. So instead air is sucked in through the drive bays and all the little nooks and cracks of the case.

You could try the tissue trick to see if you have exhaust air recirculating back into your cases vent near the expansion ports. If it blows, you have positive pressure, if it sucks, well you know .

What ive been told is that positive is better for dust, as dust will mainly accumulate at your intake fans, with negative it will be everywhere. Ive been told that negative pressure is slightly better for cooling, but is much worse with dust accumulation.
Edited by Mattb2e - 12/26/10 at 5:47pm
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