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  #61 (permalink)  
Old November 28, 2013, 12:49 PM
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In a theoretical absolute worst case scenario, the case would pressurize to a point that the fans wouldn't be able to push more air in. However, this will NEVER happen. Cases are not airtight, and the air will find a way out. Through cracks around the side panels, IO panels, expansion slot covers, etc. Positive pressure in cases is a good thing. Look at the Silverstone Raven and Fortress lines. 3 x 180 intake, 1 x140 exhaust.

Edit: ninja'd by lowfat.
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Old November 28, 2013, 11:31 PM
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or you can run the front as a exhaust air will move down and out as a fan creates alot of pressure compared to the natural rise of hot air.
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Old November 29, 2013, 08:16 AM
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I just installed a Prodigy M case with a H100 blowing into the case. I can tell you that the air being pushed by the radiator under full load is LOWER than the ambient temperature around the CPU area. The GPU does block almost all of the airflow, so I do not benefit from this for cooling down my VRM, etc, but it would clearly help keep away the radiant heat off the GPU otherwise. The air coming from the radiator really isn't all that hot/warm, even though my CPU cores are running around 70 degrees.
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Old November 29, 2013, 03:19 PM
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Quote:
Originally Posted by sf101 View Post
or you can run the front as a exhaust air will move down and out as a fan creates alot of pressure compared to the natural rise of hot air.
yup this works too... I'm convinced positive airflow is better than negative.
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Old November 29, 2013, 03:26 PM
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Nice part about positive airflow is you can somewhat control the air-flow... negative pressure you don't really know what the air is going to do because it enters through all the cracks and openings and the fan only pulls air from in front of it. Now, don't quote me here, but I could see it being possible that you have more "dead space" with no airflow in a negative vs positive. A big reason to do positive airflow is so you can place dust filters on your fans and reduce dust randomly entering your case.
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Old December 4, 2013, 09:02 PM
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Quote:
Originally Posted by SugarJ View Post
In a theoretical absolute worst case scenario, the case would pressurize to a point that the fans wouldn't be able to push more air in. However, this will NEVER happen. Cases are not airtight, and the air will find a way out. Through cracks around the side panels, IO panels, expansion slot covers, etc. Positive pressure in cases is a good thing. Look at the Silverstone Raven and Fortress lines. 3 x 180 intake, 1 x140 exhaust.

Edit: ninja'd by lowfat.
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Originally Posted by lowfat View Post
This is how I would do it. Air will always find a way to escape. It will be pushed out through the PCIe slot cover or other vents in the case.
Cool, thnx
I need to disassemble the system anyway to perform some dusting; but I'll get some dust filters though for the top fans..
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Old June 3, 2014, 06:31 PM
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Quote:
Originally Posted by clshades View Post
I can confirm that when a top rad is installed for water cooling having the fans blow into the case rather than out definitely increases cooling performance overall. Easily 5-10C cooler.

cpu is running a few degrees over ambient @3.7ghz 1.45v
GPUs are never past 50C under load with 950 on the core and 1425 on the memory.
North bridge is running 2400 40-45C and ram is maxed at 1600mhz

Everything is very stable and the mobo block is certainly helping.

Probably the best advice in water cooling I've gotten to date. Cheers man.

Basically every fan I have is blowing into the case except the rear exhaust so a FULL positive pressure setup and working much better than before.
Thank you for the info! Will definitely do that for my top 240 rad..
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Old June 3, 2014, 09:35 PM
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Don't thank me I'm just the messenger. Lowfat started the ball rollin for me to finally put the debate to rest. Venting the hot heat in the case through the rad to the outside air increases the overall temp of the water cooling system. Bringing in the coolest air possible (ambient) will always give the lowest temp water in the cooling loop. Period. Anyone who denies this fact hasn't tried or are too stubborn to try. :P
For what it's worth your welcome. :)
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Old June 4, 2014, 08:05 AM
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^^^ Yep I now have all 3 of my Rads set up as Intakes....
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Old June 4, 2014, 11:25 AM
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Positive airflow is indeed the way to go, all three rads on my 800D are intake, so much hot air exhausts through vid card PCI slots.

Made a world of difference in temps, initially I had the top and rear exhaust, switched them both to intake and dropped coolant temp by fifteen degrees.

The guys saying never intake hot air into a case are probably the same ones who try to sequence coolant flow through blocks...
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