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Need an Air Flow expert!

post #1 of 30
Thread Starter 
Hi guys I am facing a bit of a problem here.

I bought two 6950 Twin Frozr III in CF.
I got them in order to save money for Kepler which is why they are not under water.

From what I understand those cards exhaust most of their hot air into the case.

I have a Little Devil V8.

In my case I have 2x140mm options (1xrear , 1xfront)
4x120mm options (all in the top)
All fans are Bitfenix Spectre and are rated for 800-1000 RPM.

Here a picture of the case for better understanding:



I hope one of you knows these cards and how the coolers work.

I will just tell you what I think of the best airflow.


The only problem with this is that the fans in the top could negate each other but I think at 1000 RPM that shouldn´t be a problem right?

I hope you can improve or modify my idea of the airflow and help me find the perfect one for my cards and case
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post #2 of 30
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post #3 of 30
That should be fine.

Just add as many fans as you can, are there any spaces at the bottom of the case?

Honestly though, I think that it would be a shame not to have a nice water cooling setup in that case.
 
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post #4 of 30
WC it or... get a different case.

Because you're pushing hot air out of the top and rear. Which is good, but you're potentially pulling in the same hot air from the top back inside the case.

Top, rear = exhausts to remove the hot air.

Front, bottom = intake to inhale cold air.
post #5 of 30
Quote:
Originally Posted by Xenthos View Post
WC it or... get a different case.

Because you're pushing hot air out of the top and rear. Which is good, but you're potentially pulling in the same hot air from the top back inside the case.

Top, rear = exhausts to remove the hot air.

Front, bottom = intake to inhale cold air.
I think he is watercooling only his CPUs. The rads are at the bottom compartment.

Your case is so huge OP. It should be fine that way. Experiment to see what temps you get.
post #6 of 30
Quote:
Originally Posted by Riou View Post
I think he is watercooling only his CPUs. The rads are at the bottom compartment.

Your case is so huge OP. It should be fine that way. Experiment to see what temps you get.
Ah, in that case, go ahead
post #7 of 30
That seems right - Don't think you will go wrong with that setuo
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post #8 of 30
I would try your setup and then as compare setup->

rear and top left fan as outtake, all others as intake
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post #9 of 30
Kung Pow, considering you're using low RPM fans, and therefore low airflow [and theirs nothing wrong with that, silence / quietness = win ^^] I'd make all 4 top fans as well as the front fan intake and only the rear ran as an exhaust.

Why? Create a positive pressure scenario. You can control airflow a bit more and air will purposely push itself out of nooks and crannies which reduces dust sliding in. This of course is assuming you put filters on each fan intake.

With the four fans set up the way your diagram is drawn out, they will negate eachother. Even low rpm fans with low airflow can just vortex up and render them useless. I know this since it happened with my mom's case and her low speed slipstreams.

Plus, considering the coolers [Twin Frozr 3] exhaust radially into the case, which makes a positive pressure system even better as any bit of air will try to escape, which will take the hot air right out. Even with external exhaust cards, I've had better experiences with positive pressure setups. Especially with low airflow / low rpm fans, cases designed for a lower noise footprint.

Keep in mind Kung Pow, while I can obviously see you're going for a neutral airflow, which is ideal, in reality it's near impossible. I've honestly never been able to achieve a perfectly balanced airflow setup even with a 1:1 of intake and exhaust fans.. all being identical to one another. The actual flow of air changes the dynamics of balance, some fans may be closer to an exhaust point, lowering their effectiveness and therefore tipping the scale either to positive pressure or negative.

The problem is that low rpm fans give you an illusion of balance many times, simply because they do not move a lot of air, so air doesn't come rushing out at a high speed, so when you use the tissue test, it seems neutral, when it really isn't. The tissue test just in case you want to know, is when you take apart a tissue to one ply, to the point where you can see through it, then cut a strip of it, and put that up to your drive bays and see if it gets sucked into them or is repelled. Sucked in = negative pressure, repelled = positive pressure.

Sorry for the long post...I think that covers everything... I'll sub to this thread just in the event something comes up
    
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post #10 of 30
you can try 5 intake 1 outake


or 5 outake 1 intake
    
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