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Rad air flow

post #1 of 11
Thread Starter 
Hey so let me start by saying how i have my fans setup

1x front intake
3x side intake
1 rear exhaust
3x fan top on rad (exhausting air out of case)

now would it be best to leave the rear fan as an exhaust or make it an intake
post #2 of 11
Thats something your gone to have to test and tell us
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post #3 of 11
Thread Starter 
ok testing now then lol make me work
post #4 of 11
When I tested in my Cosmos S and Haf X it was better having them intake. Cool air from outside the case is always better than warm air in the case. I wouldn't expect a million degrees better, but 1-3 to me was worth it.
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post #5 of 11
Thread Starter 
no difference that real temp can pickup i think it comes down to personal preference
post #6 of 11
I have the same case as you and pretty much the same setup with radiator on top with 3x 120mm's pushing air out.

I have my rear fan as a intake and i find when im just doing cpu intensive stuff it works fine, pulling cold air in to push up through the rad.

However if im gaming i find it doesnt work so well as my graphics cards start to produce some heat the case starts to get hotter and all the air gets sucked up through the rad which obviously increases my cpu temps.

With the rear fan as a exhaust i get about - 3-4c difference while gaming.
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post #7 of 11
I would never ever make a rear fan as an intake, it completely goes against the whole concept of cooling a computer. The entire point of having fans at different places within a case is to get a stream of air flowing through the case, similar to that of a wind tunnel, but obviously quite different. Making the rear fan an intake fan, it'll basically cancel out any cooling benefits from the front fan where air will collide around the middle of the case and hopefully get sucked up through the top. This isn't terrible in itself, but considering you have so much intake already, your case is filled with positive pressure, which means you're bringing in more air than you can expel. This can cause hot spots within the case, i.e. pockets of air that stay put and do not have a true "flow" to them, and it can cause certain components in these areas to run hotter.

The basic principle is to have a good balance of intake and exhaust with proper case airflow, spot cooling components with intake fans that need them, mainly hard drives since these are the only components that do not have active cooling/heatsinks. Everything else should be cooled fine with the airflow of the case.
    
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post #8 of 11
for the fan on the ra, is it better to intake or exhaust the air out? I mean the rad for the top of the case
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post #9 of 11
Quote:
Originally Posted by `br4dz- View Post
This isn't terrible in itself, but considering you have so much intake already, your case is filled with positive pressure, which means you're bringing in more air than you can expel. This can cause hot spots within the case, i.e. pockets of air that stay put and do not have a true "flow" to them, and it can cause certain components in these areas to run hotter
Can you back this up from somewhere? Not doubting you but interested in this statement.

I have had positive pressure setups many times, with bottom, front and top intake and only back exhaust. I was under the impression is with positive air has to escape from ever crack or opening left in the case. Which to me means that air has to get out wherever it can and will not have dead spots.

Also I have tested temperatures, and always when I make the top intake on the radiator, especially when the GPU's are not watercooled. However it's possible that only relates to cases I've used.
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post #10 of 11
Quote:
Originally Posted by wondergod View Post
Can you back this up from somewhere? Not doubting you but interested in this statement.

I have had positive pressure setups many times, with bottom, front and top intake and only back exhaust. I was under the impression is with positive air has to escape from ever crack or opening left in the case. Which to me means that air has to get out wherever it can and will not have dead spots.

Also I have tested temperatures, and always when I make the top intake on the radiator, especially when the GPU's are not watercooled. However it's possible that only relates to cases I've used.
There are way too many variables to make it 100% true with every case. It is true that air will be pushed out via cracks/holes/openings, but it's a matter of how much.

Positive pressure will generally make hot spots and improper circulation, that's just how air/pressure works. Take a look at how weather works, when there is a low pressure system this is how you get most of your wind. The air is literally sucked from high pressure systems into the low pressure systems. Same works with computers, where your computer can act as a low pressure system with negative pressure, while the outside would be high/positive, allowed for a more natural airflow pattern. With negative pressure air comes in via cracks/openings instead of escaping via those openings. I'm not going to provide proof for this since it's basic physics, but you could look up are positive vs negative pressure and base your opinion/decision on that.

Now, positive pressure can show that some temperatures are lower, but it isn't painting the whole picture. Cards that do not have temperature sensors, such as a sound card, wireless card, any expansion card, RAM, mosfets/chokes on a motherboard, etc. etc. that DO NOT have substantial cooling on them such as a video card fan or CPU waterblock/heatsink, and generally aren't in the path of an intake or exhaust fan can benefit from negative pressure. Ways positive pressure would be better is if you had an intake fan pointed directly at all spots allowing for plenty of airflow to all components, but this goes against what most people want since it'll be loud, attract a ton of dust, and is impractical for the large majority of computer users. A simple 3 case fan setup is usually enough for most cooling needs, with a front intake, rear exhaust, and top exhaust. In a perfect world the front intake would larger and/or running faster than the rear/top exhaust.
    
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