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Case with 1 Fan and Case with 8 fans: No temp difference

post #1 of 8
Thread Starter 
So I hear people talking about cases that are great for air cooling all the time, and i just wanted to say that my experience has been really strange and not similar at all to what I expected:

Around 8 months ago I picked up a CM 690 II Adv and put my rig in there. I filled every spot I could with case fans, making 8 total. The 140mm fans were all black CM fans and the 120's were also CM fans (I believe they were 60 CFM). I took note of my CPU and GPU idle and load temps. Note that this case has a ton of holes in it and I had every fan installed, so it is like a giant AC unit.

Anyway, a few weeks ago I purchased a Lian Li PC-9F, a case which has no mesh on it at all. There are no open areas on the case, and you can only install 3 fans. A few days ago I opened my rig for the first time after moving parts from the first day I got it and I noticed that both my front fans were disconnected. I had forgotten to plug them in. This means that the case had only 1 fan, and that was the back exhaust. Remember, this case has no mesh so air is not being taken in from anywhere. Yet my load and idle temps were 100% exactly the same as with my CM 690 II Adv. The fans are stock Lian Li fans that are 30 CFM.

Does anyone know why this is? I find that buying a case apparently "great" for air cooling was a waste of money now, and the $50 I spent on fans also went to waste. Or is there some other thing that I am missing?
post #2 of 8
Ambient temperature differences, better cable management, there are a million reasons why this could be true.

It is certainly not a waste. You had an isolated incident where you didn't notice a difference - with no controls.

Bit-tech just posted a wonderful article on air cooling and the effect of fans on temperatures

http://www.bit-tech.net/hardware/2012/02/10/the-big-cooling-investigation/1

They investigated no fans vs several fans in all different configurations - there is certainly a difference.

In some cases obviously you won't see much of a difference. If you aren't pushing your components at all, and passive cooling is enough, then of course you wouldn't see a difference. Typically removing hot air is more important than bringing in cool air, so I'm not surprised that you didn't see much/any of a difference - you still had your exhaust going.
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post #3 of 8
yeah what aeshthetics1 said. there are many different factors that go into temps and it also has to do with what hardware you have
i know if i take the side panel off of my case my GPU gets hotter, which in turn makes my NB hotter.....
post #4 of 8
hence why its more important to have negative air pressure inside the case versus positive pressure. As its always easier to pull air out then it is to push it in.
 
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post #5 of 8
Also add to the fact that the Lian-Li is all aluminum, that helps alot too.
    
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post #6 of 8
Quote:
Originally Posted by terraprime View Post

hence why its more important to have negative air pressure inside the case versus positive pressure. As its always easier to pull air out then it is to push it in.

i think you are confusing what is cheaper and easier with what is better and makes more sense according to physics smile.gif
post #7 of 8
you had a purely negative pressure case, which is fine, your cpu was receiving the same amount of cool air as it was before probably, therefore still achieving the same cooling performance, my cpu in my smaller case with just the cpu cooler and no other case fans cools just as well as my water cooled case, so...
   
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post #8 of 8
The Lian-Li was actually engineered around its fan setup producing a linear current of air that runs over the components. Being aluminum doesn't really do much. Putting a fan in every spot on the Coolermaster just caused a mess of competing currents. Taking the positive view, the CM case is designed for more flexible cooling options based on individual need. The negative view is that the chimps at Coolermaster just slaps huge fans and grills all over the place without rhyme or reason and calls it a day.
    
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