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How much CFM is needed to make h100i reach ambient temps at load?

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  • Cooling
  • Video
  • CPUs
  • Components
Last response: in Components
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June 22, 2013 12:57:45 PM

So I was looking at this video http://www.youtube.com/watch?v=VUbpb23yTK8. The temps in that video were a joke but that kind of cooling would (should) bring the cpu to permanent ambient temperatures.
However I get the feeling that many fans are overkill to reach ambient temps.
So if my room was 10c how much CFM in airflow would it take to keep my cpu at 10c?
Also does stacking fans on top of each other actually increase CFM by that much?

More about : cfm needed make h100i reach ambient temps load

a b à CPUs
June 22, 2013 1:09:58 PM

EDIT : I saw the video.
I've got no idea how this is possible

EDIT number 2:
I do not understand how he gets temperatures lower than ambient. I thought it wasn't possible.
I thought the only permanent way of doing this would be phase change cooling.
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June 22, 2013 1:26:24 PM

As I said the temps in the video were a joke. He never really said how low the temps got. I assumed it was ambient but I'm guessing from your answer that it wasn't.
If ambient temps aren't possible then at what CFM do diminishing returns take place and stop giving increased cooling?
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a c 231 à CPUs
June 22, 2013 1:48:35 PM

CFMs aren't the best way to measure temp drops, some fans can push high CFMs in open enviroments but cannot deal with a significant pressure differential which is caused by shoving the air into the heatsink.

Non-exotic cooling methods cannot bring the temperature extremely close to ambient under load because the rate of power dissipation is directly proportional to the temperature difference between the heatsink and the air temperature, you can map a heatsink's cooling property to Watts/C for that specific heatsink and that specific fan so if you have a heatsink that keep a 100 W CPU at 10C over ambient and you want it to get to 5 C over ambient you will need to double the cooling capability either by increase the size of the heatsink or significantly increasing the fan capabilities.
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