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Airflow in Fractal R4 with h100i help

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  • Gaming
  • Temperature
  • Tom's Guide
  • Cooling
  • Fan
  • Cases
  • New Build
Last response: in Components
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April 3, 2014 9:13:05 AM

Hello, I need some advice on what to do with my setup.

In the manual of the h100i it says to use it as an intake and has it pictured at top. After a lot of reading it seems this is not ideal for the ambient temperature inside the case because it is exhausting warmer air into the case. However this is good for the CPU since it is pulling in fresh air through the radiator. I have the stock fans from fractal, and I ordered one extra.

Initially before my research I was planning on having 2 intake at the front, the h100i as an intake at the top and then exhaust at the back. If I am not mistaken this creates positive pressure, when I really want negative pressure to help exhaust the hot air.

Would it be enough if i bought a very high CFM fan for the rear exhaust? I can also use the bottom spot for another fann.

Also, my biggest question is really how much of a difference will it make if I do make the h100i exhaust out the top instead of intake? I don't think putting it at the front of my case will work. I would have to move the HDD bays.

Thank you very much for your help and information in advance!

More about : airflow fractal h100i

April 3, 2014 10:12:28 AM

Any help would be very much appreciated.
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April 3, 2014 8:49:38 PM

Why will no one help?
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April 4, 2014 12:37:37 AM

Probably better to have it exhaust at the top, exhaust at the back and intake at the front
This is what I do with my Fractal Design Define R4 and ThermalTake Water 2.0 Extreme, not much temperature difference between push or pull really. Just depends where the dust goes (in my view)
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April 6, 2014 11:11:06 PM

Hot air tends to rise.. if you had hot air pulled in, it could hurt gpu cooling or such. I recommend exhaust at top.
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April 7, 2014 5:47:06 PM

FunkyFeatures said:
Hot air tends to rise.. if you had hot air pulled in, it could hurt gpu cooling or such. I recommend exhaust at top.


Thanks for your response, I thought that since warm air rises exhaust would be best on top, but I worried that it would hurt CPU temps if I pulled warm air through the radiator.

I might get another fan, or move one of the front intakes to be a bottom intake. It would blow cool air on the GPU and chipset.

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April 7, 2014 5:50:20 PM

Devotii said:
Probably better to have it exhaust at the top, exhaust at the back and intake at the front
This is what I do with my Fractal Design Define R4 and ThermalTake Water 2.0 Extreme, not much temperature difference between push or pull really. Just depends where the dust goes (in my view)


Thanks, so it doesnt make much of a diff if you pull cool air in through the radiator, or warmer air out through it?

I guess realistically the air inside the comp never gets hotter than the CPU, and really not that much warmer that room temp most likely so it is probably negligible?

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April 7, 2014 10:15:35 PM

The most usual setup is putting it in the top exhaust place. Shouldnt hurt too bad if you still have the fan in the back.
Even if the performance would be bad, i think a lot of people would have told us :) 
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April 8, 2014 3:34:54 PM

FunkyFeatures said:
The most usual setup is putting it in the top exhaust place. Shouldn't hurt too bad if you still have the fan in the back.
Even if the performance would be bad, i think a lot of people would have told us :) 


So I flipped my h100i fans last night. It seems like the CPU runs a little bit hotter than before, but the temps seem to top out around 70c with prime95, and they had got to about 80 before, so overall I think it's better. I also moved the bottom front fan and made it an intake on the bottom of the case. This helps keep the GPU and mobo cool. Plus now with the r4, all my intakes are filtered :]
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