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Exhausting through a radiator?

post #1 of 7
Thread Starter 
Hey guys,

I'm planning my build now and am going to have the r9 295x2 GPU with its radiator on the back exhaust port but also water-cool my CPU with a radiator up top.

CPU Cooler:
Corsair H105 (which would leave one fan slot open up top)
http://www.amazon.com/dp/B00HKEI3EY/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=T08C39VOLDJQ&coliid=I1MNVM3V6YKNFA


My question is: Say, all top and back fans were covered with radiators (with fans in either push/pull or push & pull) would there be enough airflow our the top and back to cool the system?

My gut is that I would need to leave some dedicated fans just to pump out warm air, otherwise the warm air inside the case would warm the water in the radiators on its way out.

If I shrank the top radiator so that a 120mm fan could fit directly above the CPU, that could function as the hot air exhaust.

What do you think?
 
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post #2 of 7
since the loops will be seperated, the 295x2 as an exhaust would actually be Ideal imo. Wont have such warm air invading your case, the CPU will pyut off minimal het compared to 295x.2
post #3 of 7
having both rads as exhaust is fine IMO. As long as you have more intake than outtake you are golden smile.gif
post #4 of 7
Thread Starter 
Perfect, that's what I'll do. Thanks a lot guys.
 
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Corsair 900D 
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i7 7700k Strix z270e 1080ti ROG Poseidon Corsair Vengeance 16GB 2133 Mhz 
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post #5 of 7
Intake is generally prefered for best performance, but I like to run my radiators as exhaust to limit dust build up.
post #6 of 7
I agree with everyone. All my radiators are set to exhaust hot air. Two H55's in front and one H100 on top. Best solution for cooling that i tested

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post #7 of 7
Quote:
Originally Posted by mitchr46 View Post

having both rads as exhaust is fine IMO. As long as you have more intake than outtake you are golden smile.gif

True this, but "more intake than outtake" only matters as long as all of your intakes are filtered. 'Positive pressure" is only a benefit for dust control, not for cooling per se (except for the fact that dust buildup in a case will inevitably lead to issues, especially heat-related) and it only works if all the intakes are filtered to keep the dust out and more CFMs are being pushed in than are being pulled out so that every available unfiltered opening in the case becomes a place where air exhausts.

When figuring for positive pressure remember to factor in that filters are very restrictive of airflow, similar to a rad, and that's with the filters clean. They are even more restrictive as they begin to accumulate dust.

A common setup is to have all filtered fans (rad fans and case cooling fans) set to intake except for the rear fan set to exhaust as it rarely is filtered unless it's something someone added. That way all the rads get fresh ambient air and it assures filtered positive pressure, and all the exhaust gets forced out the back of the case through the rear fan and what is typically an open unfiltered grill on the back.
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