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Calling all airflow gurus - Page 2

post #11 of 48
Quote:
Originally Posted by TC_Fenua View Post
None
Check those links to see what I mean : here and here.
Hmm, interesting reads. Should I reverse the top fan on my 922?

Though, I'm curious as to why most/all cases with top fan(s) have them as exhaust if intake is better.
    
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post #12 of 48
Quote:
Originally Posted by turbonerds View Post
I Support this. Although that's how most cases come stock
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post #13 of 48
Quote:
Originally Posted by PiERiT View Post
Hmm, interesting reads. Should I reverse the top fan on my 922?

Though, I'm curious as to why most/all cases with top fan(s) have them as exhaust if intake is better.
because someone do it the first time now everyone do it.. they dont know exactly why but, better keep with the trend

there are soo many combos out there, both good and bad..oh my, humans are funny (not you btw, dont get all EMO)
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post #14 of 48
The coolest air is what comes in from the outside. In a case with two top fans, the forward fan can be set to intake and the rear fan position blocked, to form a wind tunnel effect. People who have converted from top exhaust to top intake generally see a 3-5c improvement in temps.

Air coming from the bottom of the case is warmed by motherboard components, which reduces the cooling power of your heatsink.

The front-to-back airflow can be improved by adding an intake fan in the 5.25 bay.

I also advocate removing the rear grill and rear fan to let air exit the case freely. It's also quieter.
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post #15 of 48
Quote:
Originally Posted by ehume View Post
The coolest air is what comes in from the outside. In a case with two top fans, the forward fan can be set to intake and the rear fan position blocked, to form a wind tunnel effect. People who have converted from top exhaust to top intake generally see a 3-5c improvement in temps.

Air coming from the bottom of the case is warmed by motherboard components, which reduces the cooling power of your heatsink.

The front-to-back airflow can be improved by adding an intake fan in the 5.25 bay.

I also advocate removing the rear grill and rear fan to let air exit the case freely. It's also quieter.
^ This. I was experimenting with adding a little extra fan I had to my front 5.25" bays and boy did that make a difference. My CPU max load temperatures dropped 3-5C in about 5 seconds after I put in the fan. Also this was a little CM 80mm fan I had lying around which only has about 22CFM. So adding a nice 120 or 140mm fan with about 30+ CFM should drop your temperatures quite nicely.

Unfortunately, the same can't be said for the GPU's. I went as far as to even stick my hand halfway through the case from the front while it was running on full load and tried to angle the fan towards the GPU's. It didn't even faze the temperatures of the cards...not even a single degree. That being said though, the fan was right in front of my palm which was blocking quite a bit of air.

But a fan in the front bay and reversing the top exhaust should drop temperatures quite well.
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post #16 of 48
What they said Outside air is always cooler than inside air. Having an intake on the top will produce an even better cooling configuration if you got a big cpu cooler redirecting most of the air toward the back of the case. Furthermore the top intake will push the bottom front intake air and force it toward the expansion slots on the case, cooling your graphics card(s) in the way. That's how I understand it, I might be wrong but that's what I observed
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post #17 of 48
I found lots of fans at high speeds dont do nearly as much as keeping heatsink dustfree.

Picture of your setup might help.
post #18 of 48
Wouldn't an top exhaust fan be better than an intake since hot air rises?
post #19 of 48
Quote:
Originally Posted by Butter on Toast View Post
Another question guys: When I turn on the PC my temps are HIGHER than after a few minutes of being on. My graphics card boots up and it gets to 47ºc. After 3 mins it goes to 39 and stays. Same with CPU. Is this normal?
This guy's experience should be helpful to you:-
http://hardforum.com/showthread.php?t=1551813

My additional suggestion is to stop using the top rear fan as it might just suck a great portion of hot air (exhausted from the case rear) back into the case. This kind of recirculation is obviously not desirable.

When a system is being booted up, both the CPU and GPU are busy doing their work and thus the temperatures go up higher. After a few minutes when they are done with the work, they enter idling state. With energy saving features enabled, both will downclock and therefore the temperatures go down.
post #20 of 48
Thread Starter 
Thanks to everyone for your help. Will do this when I got time, time is a luxury
More input is appreciated.

Another thing: The air duct is devilishly hard to take out, any tips in regards to the matter?
    
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