Originally Posted by RoofTopJoe
I don't think anyone was contradicting that. The point was that with positive pressure, air is forced in and has a natural tendency to look for ways out---including the cool air you just brought in. With negative pressure, the opposite is true: cool air wants to fill the case but you force it out---except you have more control over what goes out (i.e., hot air).
It is not that simple.
Putting fans in case as intake and/or exhaust is only the first step. These fans only move air in and out of case.
This does not keep the heated air from mixing with cool air.
Nor does it direct cool air where it is needed.
The path air flows inside of case is just as important.
Air seeks the path of least resistance and flows to places of less pressure.
How we manage that is what determines where the air flows inside the case. We can do this several ways; deflectors, cooler intake fans, exhaust fans, building ducts to or from CPU/GPU cooler, etc. Using a remote temperature sensor is the key to finding out where the air is flowing. Than we can make changes to get it where we want it.
I monitor the temps with a cheap indoor/outdoor wired remote or terrarium digital thermometer to monitor air temps. Twist a piece of stiff insulated wire into the last 8" of sensor lead so you can bend it to position sensor where you want it... like 40mm in front of your GPU cooler/radiator intake.. to see what the air temp going into CPU / GPU cooler is compared to room temp. The closer it is to room temp the better.. Shouldn't be more 5c maximum, 2-3c is what I usually end up with after 30 minutes full load on both CPU and GPU.
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Edited by doyll - 8/9/13 at 2:51am