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I need a little help with my case fan air layout.

post #1 of 14
Thread Starter 
Hi all. I will include a diagram/picture/thing of the layout of my PC and such to give you a better understanding of which fans I should use, and which layout is recommended for the lowest temps.

My XFX 6970's run hot, you see, hotter than I am used to, my last card was a Nvidia and it didn't run as hot as these do.

I'm not worried, they max out at like 95c at 40-50% or so fan speed. - Any louder than that and I wouldn't enjoy the noise those fans on them would make, they can get very loud the higher RPM they go.

So I need to try and find the optimal case airflow.

I have been using the "more fans is best" approach up until now but that doesn't seem to be the case so much, after reading around on the subject and visiting this site HERE.

So I was thinking maybe a low pressure option with no or minimal intake at the bottom or the front of the case, and 2 fans on the top to vent the hot air out as a priority over forcing too much air inside instead? - I have all of these slots with fans in them, but I don't have to use them all, if need be I would take them out and just use 1 or 2,3 etc if it makes for the best case airflow.

Personally I was thinking about blocking off the rear exhaust fan and using the 2 top exhaust fans instead, as hot air rises and such, it might be worth a try for better results.

What are your opinions and thoughts?



The blue lines are the intakes of the fans inside the PC, such as graphic cards intakes and CPU/PSU fans etc. Those can't be moved but the air flow direction is there to see. The case fans are the black rectangles.

I have left the airflow blank on the fan slots I have installed with no direction on them.

Edited by Eerazer - 10/16/11 at 12:23am
    
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post #2 of 14
The 6970s exhaust no heat into the case so nothing to worry about hot air circulating inside. So all the fans as intake leaving one rear case fan near CPU as exhaust will not create an issue. But you will need more fresh air as much possible for the cards intake using a side fan blowing directly to the cards. You can take one of the two top fans for this purpose.
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post #3 of 14
well batter airflow in case can take temperatures a little bit down, but I wouldnt expect 5+C, more like 2-3C

you really need better cooler for 6970
Accelero XTREME Plus II is your best option
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post #4 of 14
IMHO, Fractal Design R3 is designed more toward the acoustics and thus the high airflow is not emphasized. The 2 front intake fans are natively 'weak' as they need to pull air in through those tiny slot holes along the 2 front edges. Then, this amount of air has to go through the HDD cage. The air could be warmed up somewhat by the harddisks and the emerging velocity is impeded by the cage with harddisks.

For this reason, your two HD6970s are not happy, thermally.
(The other main reason is that their fans only spin 40-50%)

I propose, instead of relying the front fans to deliver the cool air, use:-

a) the bottom fan for cool air supply to the bottom card
b) the side panel fan for cool air supply to the top card. This may get a little tricky as I do not think the fan lines up well with the upper card's intake fan. So, you will likely need to mod a small 'duct/shroud' to channel the air towards the card's intake fan.
post #5 of 14
Thread Starter 
Quote:
Originally Posted by hawkeeyee View Post
well batter airflow in case can take temperatures a little bit down, but I wouldnt expect 5+C, more like 2-3C

you really need better cooler for 6970
Accelero XTREME Plus II is your best option
I am not able to place another cooler on these cards as that would void the warranty unfortunately. Also, I love the reference design, they just run a little hot that's all.
    
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by windfire View Post
IMHO, Fractal Design R3 is designed more toward the acoustics and thus the high airflow is not emphasized. The 2 front intake fans are natively 'weak' as they need to pull air in through those tiny slot holes along the 2 front edges. Then, this amount of air has to go through the HDD cage. The air could be warmed up somewhat by the harddisks and the emerging velocity is impeded by the cage with harddisks.

For this reason, your two HD6970s are not happy, thermally.
(The other main reason is that their fans only spin 40-50%)

I propose, instead of relying the front fans to deliver the cool air, use:-

a) the bottom fan for cool air supply to the bottom card
b) the side panel fan for cool air supply to the top card. This may get a little tricky as I do not think the fan lines up well with the upper card's intake fan. So, you will likely need to mod a small 'duct/shroud' to channel the air towards the card's intake fan.
Yeah, that's about right and that's what I have been doing thus far, I used the 2 front, side and bottom fans as 4 intakes, and 1 exhaust at the rear.

But that's not creating negative pressure, and there is more air going into the case than out, so the hot air is largely lingering inside the system... well.. actually it was pretty cool in there with that configuration while those cards weren't in there, but that website in my OP has got me thinking.

Which is why I though about having more fans exhausting than intake. I read somewhere that you should have 2 exhaust for every 1 intake or so.
Edited by Eerazer - 10/16/11 at 7:52am
    
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post #7 of 14
Accelero Xtreme is out. The R3 wont fit it I believe.

I'd drill another space for 120mm mounting above the provided one, though you might need to cut the provided noise-dampening foam. That should help quite a bit. Then fill those up with fans. If you want the silence, use Noctua Fans.

Remove the unused HDD bays. And ziptie more fans on the back of the unused HDD cage. Again, use quieter fans, as you bought the R3 either for the sleek aesthetics & silence.
    
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by sloppyjoe123 View Post
Accelero Xtreme is out. The R3 wont fit it I believe.

I'd drill another space for 120mm mounting above the provided one, though you might need to cut the provided noise-dampening foam. That should help quite a bit. Then fill those up with fans. If you want the silence, use Noctua Fans.

Remove the unused HDD bays. And ziptie more fans on the back of the unused HDD cage. Again, use quieter fans, as you bought the R3 either for the sleek aesthetics & silence.
Yeah, I am not willing to chop my case up though for the sake of a few degrees. I really like the case and that would be a shame to butcher it.

I use Arctic F12 120mm fans which are pretty nice and better than the Fractal ones I mounted in the front.

I am thinking there isn't much I can do to help, except maybe use the bottom and the side fan as intakes, then use the top 2 slots to exhaust air outside of the case and block off the rear with a sound proofed plate which is possible... or I don't have to block off the rear at all, and use those as 3 exhausts to 2 intakes and not use the front 2 fans at all.

So much choice. :/
Edited by Eerazer - 10/16/11 at 8:16am
    
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post #9 of 14
Quote:
Originally Posted by Eerazer View Post
Yeah, that's about right and that's what I have been doing thus far, I used the 2 front, side and bottom fans as 4 intakes, and 1 exhaust at the rear.

But that's not creating negative pressure, and there is more air going into the case than out, so the hot air is largely lingering inside the system... well.. actually it was pretty cool in there with that configuration while those cards weren't in there, but that website in my OP has got me thinking.

Which is why I though about having more fans exhausting than intake. I read somewhere that you should have 2 exhaust for every 1 intake or so.
I wonder where all the hot air lingering inside the case come from? I mean, all the air entering into the case are 'good' air and they are cool.

Your two HD6970s exhaust all (well, almost, like 90%) the heat out of the case via the rear. They contribute very very little in this regard.
And, the Silver Arrow also exhausts out of the case in a fairly straight forward fashion.

The only possibilty left is the harddisks. Do you have a high number of harddisks inside the HDD cage? See the pic below. If you have all eight harddisks, I suppose they could well produce the amount of warmed air big enough for the warmed air to linger inside the case (due to insufficient case exhaust).

So, is this the situation? From your sig, it looks like you have only three.
post #10 of 14
Your best results will be to replace the front stock R3 fans with some better ones, install a side-panel fan to cool the GPU's, and install the front top case fan as an intake for CPU intake. You want positive airflow, not negative. There is really no where for hot air to get stuck, except around the NB area.
Edited by Redwoodz - 10/16/11 at 8:58am
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