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post #21 of 30
Air goes where you push it. If you have top exhaust fans you will suck the air warmed by your gpu's up. Now, if you have a heatsink aircooler up there, your temps will worsen. If you have a rad in the bottom, you might as well pull all your air up and out.

I use top intake in my case. I have the rear top fan position blocked off so I can get a wind tunnel effect. Of course, I also use a variety of aircooled heatsinks. Here is a recent bit of airflow:



Note that I have no rear exhaust fan or rear grill. The pull fan does my case exhaust for me (see item 2 in my sig).

As for your gpu's, make sure you have all of your slot covers removed to encourage airflow out the back.
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post #22 of 30
Thread Starter 
The difference with my system is that I don´t have two Twin Frozr III in CF you guys seem to forget that.

Those cards will exhaust all their hot air into the case so I need to have strong exhaust capability in my case.
But at the same time I need to supply the cards with good cool air.

Tell me ehume would that work:

Or would the fact that two of the top fans are exhaust and the other ones intake be a problem because they would negate each other or the intake fans could suck in the air exhausted by the exhaust fans?

If that is the case my only choice is to set all the top fans as exhaust , rear as exhaust and front as intake.
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post #23 of 30
the reason why you need to put lot's intake or exhaust is to give strong pressure inside your case

when i looks at your case design there are lot's of ventilation hole near your PCI slots
you cannot ignore that hole, cause giving enough pressure, that hole can becoming extra airflow for the case

if there lot's exhaust, automatically it's will becoming intake hole
if there lot's intake, automatically it's will becoming exhaust hole

let me give you some example, there is 3 person on same room, MR A, B and C
Then MR A fart next to MR B, while MR C location was far from both of them.
think about it logically, MR B gonna suffer from such attack, cause he is the nearest person from MR A, while MR C won't smell anything cause he is far from the them.

it's same work with the fan
if you put intake and exhaust next to each other, the cool air from the intake gonna get sucked by exhaust next to it and make both intake and exhaust less efficient. to make it simple, the fan affect nearest air first before affected whole air inside the case.

the problem is you could say fans silent oriented = weak pressure, cannot affect whole case airflow, so the MSI Twin frozz will be less affected by the fan configuration.

Ehume advice can be nice solution to improve airflow near MSI twin Frozr
Edited by salvanos - 5/21/11 at 12:46pm
    
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post #24 of 30
Thread Starter 
So you mean if I do top 4x120mm exhaust + rear exhaust + only front intake the ventilation holes will automatically become intake wholes because of the negative pressure?

Please keep in mind I have 800 RPM fans...there will be no pressure or turbulence in the case
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post #25 of 30
Quote:
Originally Posted by Kung Pow View Post
The difference with my system is that I don´t have two Twin Frozr III in CF you guys seem to forget that.

Those cards will exhaust all their hot air into the case so I need to have strong exhaust capability in my case.
But at the same time I need to supply the cards with good cool air.

Tell me ehume would that work:

Or would the fact that two of the top fans are exhaust and the other ones intake be a problem because they would negate each other or the intake fans could suck in the air exhausted by the exhaust fans?

If that is the case my only choice is to set all the top fans as exhaust , rear as exhaust and front as intake.
With a Koolance 370 you do not need a wind tunnel effect. That is for air coolers. For you, all four top fans should be exhaust to help your gpu's get their hot air out of the case.
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post #26 of 30
I would tend to agree with the above.. from my experience with using hot GPU/s in a case.

I would have airflow from the side, directly on the GPU/s with fans in the rear and top exhausting air...and all other fans [side and front] on intake.

*if you have a rad for wc loop.. i would put it on the outside of the case as well to expose it to lower ambients regardless of fan direction it will be cooler than in-case.
post #27 of 30
Quote:
Originally Posted by Kung Pow View Post
First of all thank you ALL for your effort , especially Monkeypoo and Salavanos
+rep

-----------------------------------------------------------------

I will mention all problems and number them.


1.)The negation of airflow by putting intake/outtake next to each other.
I have actually never read anywhere that two fans could negate each others airflow if put next to each other when having different push/pull designations.

You have to imagine the airflow like a barrel ...if you put two fans next to each other the barrel of air cannot be impeded by either one ....but once the barrel expands as air is gas not the negation of airflow but rather of the sense of cooling is enitiated.

Example:exhaust blows the air out and the intake fan right next to it sucks the hot air back in the case.
Monkeypoo already mentioned that and he is completely right!
Only one thing though....the hot air mixes with the cooler ambient air first so it wouldn´t be 100% bad case exhaust air but rather 50-40% cooler air because it had the chance to mix with the ambient air before being sucked in by the intake.

So let´s give the top 2x120mmexhaust + top 2x120mm intake idea a B- .



2.)Salvanos brought up a pretty nice idea ....in his first picture.
4x120mm intake + rear intake + front exhaust.

Basically that would be a very nice idea for a normal gpu setup.
This positive pressure would be great for reference cooled gpu´s.
But please consider these are Twin Frozr III CF.
Those coolers will exhaust most of the hot air into the case.
So the heat would only mix and cluster with a 90% intake / 10 % exhaust fan setup.

Which is why I give this idea a C+

3.)Then there is the 90% outtake + 10% intake theory which is displayed in Salvanos second picture.

I think this is one of the best ideas because the TWFIII´s exhaust air will be exfiltrated to a 100%.
The only weak point is the intake capability.
A single 140mm intake from the front which is about 3 foot (80cm) away from the gpu´s is just not enough to supply them with sufficient cool air.

The success of this theory depends on how the TWFIII work and what they prefer a good exhaust and can cool on neutral air ..or if they need good exhaust + good intake.
Which leads us to my personal idea

4.)left top 2x120mm exhaust + right top 2x120mm intake + front 140mm intake

In theory this would be the best of all ideas but unfortunetly there are too many flaws and unanswered questions in it.

Will the intake fans suck in the hot/mixed hot air back into the case even though they are very low RPM?

Will the fans even negate each other or will they be able to work independantly?

hmmmm not sure yet

Also please note the 140mm fan option in the bottom of the upper section and top of the lower compartment is where the PSU will be installed ...no fans there^^
That's all well and good for a theoretical idea, but the simple fact is you won't know unless you actually test it out. Common knowledge is just "Heat rises, so top fans have to be exhaust". But, when I switched my top fans to intake it dropped my CPU and mobo temps by about 5C. Having your top fans be exhaust and intake next to each other may prove to be a problem, but maybe not. It depends on so much variables, from enclosure to walls to just airflow in your room. Don't rule anything out because of some theoretical idea. Just try it and check the temps.

On a side note, I have case exhausting CF 6850s now and I'm also looking into this. The temperature just rises so slowly, so the case ambient must by rising and the cards just keep using warmer air on the heatsinks /sadface. I think either getting a fan on the HDD cage to blow straight into the cards might help, but exhausting all that heat is the problem.
Edited by a pet rock - 5/22/11 at 3:09am
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post #28 of 30
Quote:
Originally Posted by a pet rock View Post
That's all well and good for a theoretical idea, but the simple fact is you won't know unless you actually test it out. Common knowledge is just "Heat rises, so top fans have to be exhaust". But, when I switched my top fans to intake it dropped my CPU and mobo temps by about 5C. Having your top fans be exhaust and intake next to each other may prove to be a problem, but maybe not. It depends on so much variables, from enclosure to walls to just airflow in your room. Don't rule anything out because of some theoretical idea. Just try it and check the temps.

On a side note, I have case exhausting CF 6850s now and I'm also looking into this. The temperature just rises so slowly, so the case ambient must by rising and the cards just keep using warmer air on the heatsinks /sadface. I think either getting a fan on the HDD cage to blow straight into the cards might help, but exhausting all that heat is the problem.
I like you approach: try things out and test them. +rep

I also like the idea of a side exhaust to deal with the heat output from gpu's expelling their heat into the case. Definitely worth testing out, especially if you have adequate intake from the HD cage (mid-case fan helps here) and maybe a bottom intake fan.
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post #29 of 30
Thread Starter 

Not so sure good airflow will do the trick anymore.
Even if I have great exhaustion in my case the top card will still eat all the heat coming from the lower card before hitting the first exhaust rear fan which is of course higher then the second card.

As single card the TWFIII shouldn´t be a problem but in SLI the story changes.

I know the guy in the video has Tri SLI unlike my CF and he has 580´s which of course run hotter because they pull more watts than 6950´s but still the main idea is transfered here.

Even with the big PCI Slot spacing of my Gigabyte X58A-OC which will give my 6950´s Twin Frozr III good room to breathe the top card will suck up the hot air of the lower card before the heat is able to be exhausted

That presents the disadvantage in cooling when set up as CF/SLI or more.

I am a little sceptical right now ...
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post #30 of 30
I think your over analyzing it... Just do it.. if its too hot, order more air
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