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Computer case cooler fan is worthless?

post #1 of 10
Thread Starter 
Hi,

I can control the revs of my CPU cooler fan and the compute case cooler fan with two knobs. When I speed up the CPU cooler fan speed it does make a big difference (results in 8-10 °C less CPU temp in a matter of a few minutes). On the other hand when I increase the rpm of the case cooler fan (it sucks out and blow out the air from the computer case), lets say from 800rpm to 3000rpm nothing happens. Even if I wait for as long as ten minutes, CPU temperature won't decrease. I can feel the increased amount of warm air it pushes out but this does not affect the CPU temperature at all. How is that possible? (I don't want to change the direction of the case fan as then it would suck in the warm air pushed out by the power supply's fan.) What is wrong? Or is this a normal phenomena?

Thanks
    
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post #2 of 10
Thread Starter 
Sorry, I forgot to mention, when I write "CPU temperature won't decrease" I mean it does not do any, not even 1°C, difference...
    
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post #3 of 10
Check the temperature of your other components. Also, what is your ambient?
    
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by MR KROGOTH View Post
Check the temperature of your other components. Also, what is your ambient?
Well, ambient temperature right now is 25.5°C. SpeedFan says the mobo sensor 1 is 41°C, mobo sensor 2 is 33°C.

By the way (different topic)... Right now CoreTemp says my Core 1 is 45°C and Core 2 is 43°C. In the same time SpeedFan says my Core 1 is 40°C and Core 2 is 39°C. Which is right?
    
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post #5 of 10
Quote:
Originally Posted by aambrozai View Post
Well, ambient temperature right now is 25.5°C. SpeedFan says the mobo sensor 1 is 41°C, mobo sensor 2 is 33°C.

By the way (different topic)... Right now CoreTemp says my Core 1 is 45°C and Core 2 is 43°C. In the same time SpeedFan says my Core 1 is 40°C and Core 2 is 39°C. Which is right?
I'd go for core temp.
    
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by MR KROGOTH View Post
I'd go for core temp.
Yes, I though so too.

Maybe my mobo is a bit warm. I opened the computer case and guess what - no effect on CPU temperature...
    
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post #7 of 10
You haven't specified your case in your system specs.

Most people find that opening the side of their case gets them cooler temps than leaving it closed. That is a sign of poorly designed airflow.

Another sign of poorly designed airflow is the uselessness of case fans. Much of the time exhaust fans pull their air in from nearby, not through the case.

I don't use any exhaust fans. Instead, I cut out my rear grill and leave the space empty. I also use a top intake fan to get fresh air to my cpu heatsink. Pretty much all the rest of my case is involved in cooling my HD's, my mb, my chipset and my gpu. When the case was buttoned up, cpu temps dropped 3c. This was in addition to using a D14 heatsink, so further lowering the cpu temp is something of a miracle. Other people report 5c drops going from top exhaust to top intake.

Since the above results I have added a pair of front intake 80mm fans. I expect to re-do my case to put a 120mm fan in my 5.25 bay, but for the moment the little ones are all I have room for.

Here's my airflow plan:



The idea is to create a wind tunnel.

Good luck with your airflow.
Edited by ehume - 3/6/11 at 8:44am
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by ehume View Post
You haven't specified your case in your system specs.

Most people find that opening the side of their case gets them cooler temps than leaving it closed. That is a sign of poorly designed airflow.

Another sign of poorly designed airflow is the uselessness of case fans. Much of the time exhaust fans pull their air in from nearby, not through the case.

I don't use any exhaust fans. Instead, I cut out my rear grill and leave the space empty. I also use a top intake fan to get fresh air to my cpu heatsink. Pretty much all the rest of my case is involved in cooling my HD's, my mb, my chipset and my gpu. When the case was buttoned up, cpu temps dropped 3c. This was in addition to using a D14 heatsink, so further lowering the cpu temp is something of a miracle. Other people report 5c drops going from top exhaust to top intake.

Since the above results I have added a pair of front intake 80mm fans. I expect to re-do my case to put a 120mm fan in my 5.25 bay, but for the moment the little ones are all I have room for.

Here's my airflow plan:
Thanks. Well, I know my case is too small and it is located at the wrong place (in a corner, too close to walls). I wish I had bigger case (and more place around my desk).

I know a harcore overclocker who doesn't even have a case. The motherboard rests on a six or eight big pensil erasers. You can turn on the computer (as there is no case, no swith) by short-circuiting two pins on the motherboard with the tip of a ball-point pen. There is a huge cooler on the processor, biggest I ever seen (18cm fan and approx 4kg copper...). Plus, there is a big desk fan (approx. 20 inches in diameter!) which pushes an enormous amount of air directly onto the processor cooler (which, again, is huge). I am not sure what processor the guy has but he runs it well above 4GHz... That is weird, isn't it? All the computer parts are just on the top of the desk, cables everywhere etc... Looks weird :-) My wife would kill me if I did that :-))
    
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post #9 of 10
My own case is pretty small, since it sits under a shelf in my desk cabinet. Plenty of things you can do with airflow.
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post #10 of 10
Quote:
Originally Posted by ehume View Post
My own case is pretty small, since it sits under a shelf in my desk cabinet. Plenty of things you can do with airflow.
my case has 7 fans in it. It has a 140 MM in the front, in front of the hard drives, it has a 120X38 in the bottom for bottom intake, it makes an insane amount of airflow inside my case, 1 80 in the side of my case, 1 80 in the top for top exhaust, and 2 80s in the back. The 2 80s in the back are soon going to be removed from the case as im going to upgrade them to 4 80X38's with a radiator for water cooling.
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