Multiple radiator case airflow issues.

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msamuelson99

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I have a Corsair 300d case. I am running an h100i and an H55i. My problem is that I really do not get much airflow. Currently my fan setup is Front 140 AF intake, 120 SAF Radiated exaust below that. on the back a 120 AF Exhaust and then a 120x2 SAF radiated exhaust on top. My temps are ok, but I have to leave the front of the case off. Is there a better config anyone would recommend?
System:
Slightly oc'd i7-950- 50C at load

12gb ddr 1333 - 6 2gb sticks - Tiple Channel

Radeon- 290x cooled by the h55i with kraken assembly.- 60c at load VRM 72C is the highest I have seen

Supernova power supply
 
Solution
Gam3r01
That would be my suggestion.
The whole positive vs negative pressure thing is utter BS when it come to computers. Negative should draw in more air, positive keeps dust out.
However, fans used in computers can not possibly create enough pressure to make either of these happen. Ignore the whole pressure debate, it actually means nothing.
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Gam3r01

Gam3r01

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Do you mean 300R, or 350D?
If I understand, you only have a single intake fan?
You should have two intakes at the bottom front (preferably 2x140mm). Move the H55i to the rear and set it as exhaust, H100i top exhaust, and the 140mm and 120mm AF fans for intake.

The way you described it your H55i is dumping hot air right into the intake fan.
 
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msamuelson99

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Thank you for the reply :) . Your suggestion was how I originally had it set up and my nb/sb temps were dangerously high. How I have it set up now is actually better provided I keep the panel/filter off the front as you are right. the h55i was channeling hot air back into the intake. I am just not getting enough exhaust out of the h55i and h100i to use them as the only exhaust.

Oh, and the case and airflow diagram (should have done this from the beginning sorry, http://screencast.com/t/f17kqtSAoT
 
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msamuelson99

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So your saying this http://screencast.com/t/WHKNwka70lna ? This would definitely create a positive pressure. Is not negative pressure better?

I appreciate the help. In the past I never had this issue as my cases were monstrous and I was able to create tunnels.
 
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Gam3r01

Gam3r01

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Jan 12, 2013
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That would be my suggestion.
The whole positive vs negative pressure thing is utter BS when it come to computers. Negative should draw in more air, positive keeps dust out.
However, fans used in computers can not possibly create enough pressure to make either of these happen. Ignore the whole pressure debate, it actually means nothing.
 
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Solution
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msamuelson99

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Aug 5, 2008
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Thanks again for the help, Cheers
 
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msamuelson99

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Ok, so I just forget about it and went for broke. Removed the hard drive cages installed the 3.5 hdd against the back wall, my ssd is mounted in one of the top 5.25 bays. Fan configuration is 2x14cm intake static Riings, 2x12cm exhaust static Riings on top, and 1x12cm exhaust static Riings in the back. Over all the cooling works just fine with a heavily overclocked i7-950 and 290x. Surprisingly the original setup I had was a couple degrees cooler all around, but I had to leave the front filter and cover off the case. Now, all the bits and bobs are correct and there is only a 2 degree Celsius difference. It is quiet, efficient, and I think it looks pretty snazzy.
http://screencast.com/t/T6gSW6Dt6H7y
 
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Gam3r01

Gam3r01

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Looking pretty fancy.
One last suggestion: The two fans you have on the H100i should be placed under the radiator blowing air through it, out the case.
While the orientation you have (pulling air through the radiator) also work, the pus method generally works better.
 
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msamuelson99

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I got the idea after doing a ton of research. The idea is that you sacrifice a couple of degrees to easily clean the radiator without having to disassemble the whole thing. Stress test with this configuration puts my temp at 49 with a full load that is 2 degrees higher than when I had the fans pushing through the radiator. The graphics card was exactly the same temp either way. The vrm's in this configuration are about 4 degrees higher. My case temps even after a couple hours of stress testing maxed at 4 degrees over first idle temps. 28c-32c. If I wanted to lower my temps further I think I would have change out my memory for less sticks and honestly, I haven't needed more than I have and the timings are working flawlessly with the high overclock I am pushing. The next step for me is a GTX1070 and an HTC VIVE. Thank you for your help. You got me on the right path and I appreciate it!

Cheers,
 
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