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Side Case Fan debate

post #1 of 7
Thread Starter 
Wondering if using my Side 120mm Fan that normally blows air onto my 6850s would be more beneficial as an exhaust. Heres the technical details:

- I have 3 120mm fans as front intake on my Xigmatek Utgard. 2 are HDD cages and one is just free mounted.Which is the bottom one.
- My 6850s are not reference, so they don't blow air out of the case.
- My CPU cooler is mounted so air is dispelled Vertically.
- My case has a 120mm Rear Exhaust fan, and a 140MM top mounted and 140mm top mounted exhaust.

So naturally my case has a positive pressure to it. Would it be better to use the side fan as an exhaust and pull warm air circulating around the 6850s out? Or have is push air in?
Edited by Bryst - 10/11/11 at 5:59pm
post #2 of 7
I'd say keep it positive pressure. The setup in the image is how I would do it as well. Maybe even make that back exhaust an intake as well.

edit: This based off you having reg 1k rpm case fans and then a serious fan on the vertical CPU cooler.
Edited by discipline - 10/11/11 at 6:02pm
post #3 of 7
Your question is impossible to answer without knowing the CFM of all the fans (including your PSU fan).
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post #4 of 7
Positive pressure/intake is the way to go with side fans. I've tried what you are considering a couple of times and always saw higher gpu temps. Cooler external air blown directly into the gpu wins every time.
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by billbartuska;15267946 
Your question is impossible to answer without knowing the CFM of all the fans (including your PSU fan).

PSU fan pulls air in from outside of the case, as its mounted on the bottom.

140s push 63CFM and 120 do about 60.

But the 120s are on a fan speed regulator so they dont always run at their standard 1500RPMS.....
post #6 of 7
Thread Starter 
Quote:
Originally Posted by Robilar;15267979 
Positive pressure/intake is the way to go with side fans. I've tried what you are considering a couple of times and always saw higher gpu temps. Cooler external air blown directly into the gpu wins every time.

Thanks for the reply. I guess this gives me nothing to do tonight lol.
post #7 of 7
I get better GPU temps on my 5830 when I have the lower side case fan (gpu) set as exhaust. I have an XFX 5830 which just circulates the air in the case. Ultimately it's usually a good idea to test different setups for your particular case and fan setup.
Edited by Swiftdeathz - 10/11/11 at 8:39pm
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