Fan setup and cpu fan orientation

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pm4

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Apr 28, 2014
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Hello

I would like to ask about recommendations for fan setup for my soon to be build.
Full build is in my details, but important parts for this topic:

Case:
Corsair C70 Vengeance - I ll use different side window without perforation

Fans (all are PWM)
- Front intake - 2x Noctua NF-P12 (bottom one between drive bay and front panel, top one directly on front panel and top drive bay removed)
- Rear exhaust - 1x Noctua NF-S12A
- CPU cooler NH-U14S (single fan aiming towards rear exhaust)
- 1x r9 290x vapor-x with 3 fans pulling air to card
- PSU fan facing to perforated bottom of case

Anti dust protection
- Sabertooth Z97 motherboard with full dust covers on all unused ports.
- dust filters - stock at front and bottom
- dust filters - extra on top and may also put one on rear exhaust if needed

I got 2 questions:
1. Should I add 2x Noctua NF-A14 as top exhaust to create negative pressure?

2. If I add those 2x NF-A14 should I turn CPU cooler to aim towards top? That case it would be pulling air from around GPU backplate and pushing it towards NF-A14 on top exhaust.


As I understands it:
pros of negative pressure
-better cooling

cons
- more noise as 2 more big fans will be included
- as i understands more possible dust to get in through various holes


Thank you in advance for all answers and comments.



 
Solution
RCguitarist
You don't need filters on the rear exhaust, no dust will come in that way. Since you have 2 fans for the intake, I would just add 1 fan to the top exhaust. Add it to the rear-most position on the top. That will balance the pressure inside your case. For the CPU cooler direction, keep it blowing to the rearyou don't want it pulling in all of the hot air directly from the GPU below it.

As for the filters you do need, cover the unused top fan area completely. Then filter the front fans and the top exhaust fan. I use pantyhose to filter my PC and it is always nice an cool inside the case and I never get dust in the case. Seriously, after 3 months go by I will check the inside and there are maybe 3 specks of dust on the top of the...
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lowriderflow

lowriderflow

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Jul 5, 2010
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i'd leave it as is... with two dust filters on the empty top holes.

you dont need a dust filter on the rear exhaust.


another option would be two 120mm top exhaust fans (no needs for dust filters if they're exhaust)
Set the CPU cooler to blow out the top, and flip the rear fan to an intake (add filter)... then you have fresh air immediately into the CPU cooler and immediately out the top of hte case

the GPU getting cool air from the fron intake.

everything is happy
 
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RCguitarist

RCguitarist

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Apr 2, 2013
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You don't need filters on the rear exhaust, no dust will come in that way. Since you have 2 fans for the intake, I would just add 1 fan to the top exhaust. Add it to the rear-most position on the top. That will balance the pressure inside your case. For the CPU cooler direction, keep it blowing to the rearyou don't want it pulling in all of the hot air directly from the GPU below it.

As for the filters you do need, cover the unused top fan area completely. Then filter the front fans and the top exhaust fan. I use pantyhose to filter my PC and it is always nice an cool inside the case and I never get dust in the case. Seriously, after 3 months go by I will check the inside and there are maybe 3 specks of dust on the top of the psu, that's it. Just cut a piece big enough to stretch over the outside facing side of the fan, then keep it in place with a rubberband wrapped around the side of the fan. Or you can just buy these: http://www.newegg.com/Product/Product.aspx?Item=N82E16811999217

They work great too. I use one on my side door intake fan and as I said before, no dust ever.
 
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Solution
P

pm4

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Apr 28, 2014
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That 2nd option is interesting idea. I just wonder if I won't get too much heat from GPU backplate (which would be few cms from fan) to CPU cooler, but when I think about it, do anyone know where is most heat going from GPU? Backplate is solid with no airflow holes so air pushed into GPU from bottom should go to sides, through GPU heatsink either towards back of case and out of case or towards front of case where it should hit airflow from front fan or should raise/be sucket towards top of case. But in both cases hot air from GPU should go around CPU cooler.

So setup would be 2x front intake, 1 rear intake and 2 x top exhaust?
But not sure if it would be positive or negative pressure, but I think it would be closer to positive.

To RCguitarist:
Thank to you too for idea hard to choose both looks viable.
About filters I see you use nice trick :), well I already got full set of dust filters for every possible main mesh on that case so I ll use those.
 
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