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high cfm back exhaust fan.

post #1 of 8
Thread Starter 
Hi,
My question is if I my rear exhaust fan is of higher CFM than that of my cpu heatsink fan,will the cpu fan get lesser fresh air.

Longer version with details.
i replaced my rear exhaust fan with a higher cfm fan.
i think its cfm is quite higher than that of my heat sink fan(stock intel 1156)(no idea ehat the cfm of the intel fan is confused.gif )

there is 2-3C drop in the idle temps of core and similar is the case with my hdd and mobo.

but the full load temps have risen by almost 5-8C.

i think as the rear exhaust fan is quite close to the processor,the processor fan may be getting lesser fresh air.

any1 else have a rear fan of higher cfm?

placement of fans as shown in the picture.
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post #2 of 8
Quote:
Originally Posted by breadcrums;15592399 
My question is if I my rear exhaust fan is of higher CFM than that of my cpu heatsink fan,will the cpu fan get lesser fresh air.

No, not appreciably less.

It will likely get more cooler air.
Quote:
Originally Posted by breadcrums;15592399 
i replaced my rear exhaust fan with a higher cfm fan.
i think its cfm is quite higher than that of my heat sink fan(stock intel 1156)(no idea ehat the cfm of the intel fan is confused.gif )

there is 2-3C drop in the idle temps of core and similar is the case with my hdd and mobo.

but the full load temps have risen by almost 5-8C.

i think as the rear exhaust fan is quite close to the processor,the processor fan may be getting lesser fresh air.

The stock Intel cooler has it's fan speed controlled by a thermistor.

When the case air is cool the CPU fan slows down. This can often make CPU temps higher in a cooler case than in a warmer one.

The rear exhaust fan is not the problem.

You could short the thermistor on the stock fan and force it to run full speed all the time. If this is too loud you could have your board could still control the fan speed as the PWM wire would still be connected.

Or you could just replace the fan and/or the heatsink.
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post #3 of 8
Your rear fan being so close to your CPU may be causing and odd movement of air, try mounting your rear fan to the outside of the case (still blowing air out of the case obviously) to give more breathing room for that cpu fan. My cpu temps dropped a bit after I moved my exhaust fans to the outside of the case, even though my case temps remained about the same.
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post #4 of 8
The other thing you may be doing is drawing the gpu exhaust to the upper part of your case. When you deleiver warmer air to any heat-shedding device, whether it is a rad or a heatsink, the heat-shedder will be less efficient.
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post #5 of 8
Thread Starter 
Quote:
The stock Intel cooler has it's fan speed controlled by a thermistor.

When the case air is cool the CPU fan slows down. This can often make CPU temps higher in a cooler case than in a warmer one.

The rear exhaust fan is not the problem.

You could short the thermistor on the stock fan and force it to run full speed all the time. If this is too loud you could have your board could still control the fan speed as the PWM wire would still be connected.

Or you could just replace the fan and/or the heatsink.

thank you for the elaborate reply cheers.gif .i just disabled the smart fan function in the bios,my cpu fan is running at its highest speed now(noise aint a problem as the ceiling fan in my room at full speed is just as loud tongue.gif

Quote:
Your rear fan being so close to your CPU may be causing and odd movement of air, try mounting your rear fan to the outside of the case (still blowing air out of the case obviously) to give more breathing room for that cpu fan. My cpu temps dropped a bit after I moved my exhaust fans to the outside of the case, even though my case temps remained about the same.

will do that.will post if it made a difference.thank u smile.gif

Quote:
The other thing you may be doing is drawing the gpu exhaust to the upper part of your case. When you deleiver warmer air to any heat-shedding device, whether it is a rad or a heatsink, the heat-shedder will be less efficient.

i dont think that is the problem.as you can see in the fan layout photo(ms paint tongue.gif ) i have attached in my first post,my gpu is between an 80mm fan blowing at the it and a 120mm fan directly behind the gpu throwing air out.the setup is kinda gettho tongue.gif
heres the link to my post in this 'Gettho rigging' thread cheers.gif
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post #6 of 8
Thread Starter 
well,i am having some really improved temps since i switched my exhaust fans.having high cfm exhaust helps smile.gif
(but a lot of dust gets sucked in!!a blower after 5 days and it looked like the roadrunner just went thru my case..i.e. leaving a lot of dust !)
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post #7 of 8
Good to know it helped you out. Air flow lines have a huge affect on cooling. Just becasue there is a lot of air moving through a case does not mean it will be cooler if the fans are all conflicting for air.

As to the dust, I have a negative pressure case too (more exhaust than intake) and I have to constantly blow out my case. Damn high cfm top exhaust fans!
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by MobAttack View Post

Good to know it helped you out. Air flow lines have a huge affect on cooling. Just becasue there is a lot of air moving through a case does not mean it will be cooler if the fans are all conflicting for air.

As to the dust, I have a negative pressure case too (more exhaust than intake) and I have to constantly blow out my case. Damn high cfm top exhaust fans!

i agree,good air flow is necessary. turbulence can have a very bad effect on cooling.
how i check if m airflow is good is keep a source of dense smoke,i use a bunch of incense sticks(i live in india and every house has em!religious thing smile.gif
or it that smoke isnt dense enough,hold a couple of really cheap cigars..(WARNING: room will reek of cheap tobaco for the whole day!) in front of the case and u can observe from where the smoke enters faster and how it travels and from i exits faster.
Edited by breadcrums - 11/11/11 at 12:19pm
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