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cpu fan direction?


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#1 RainbowSix

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Posted 14 December 2009 - 06:46 PM

This is something I've always wondered, but I've never wanted to turn on my computer with the side cover off.
I have an Athlon II CPU. What direction is the airflow from the CPU heatsink-fan? Does it blow onto the heatsink or away from it?
I assume a side exhaust fan should flow in the same direction.
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#2 ReviverSoft

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Posted 14 December 2009 - 07:18 PM

This should help:
Cooling Guide
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#3 RainbowSix

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Posted 14 December 2009 - 07:26 PM

This should help:
Cooling Guide

I read it, but don't see what I need.
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#4 ReviverSoft

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Posted 14 December 2009 - 08:00 PM

I have an Athlon II CPU. What direction is the airflow from the CPU heatsink-fan? Does it blow onto the heatsink or away from it?
I assume a side exhaust fan should flow in the same direction.


A CPU fan should blow air away from the CPU only if you have another fan blowing air to the CPU from another direction.

In most cases, air is generally blown onto the heatsink to cool the proccy and help disperse the hot generated by it, through the heat sink.

Hope this answers your question.

Edited by ReviverSoft, 14 December 2009 - 08:18 PM.

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#5 Animal

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Posted 14 December 2009 - 08:08 PM

It depends on the configuration of the case fans, which direction the CPU fan will draw. But like almost anything related to computers you have supporters of both sides.

See this argument for example: http://www.tomshardware.com/forum/170530-29-direction

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#6 RainbowSix

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Posted 14 December 2009 - 09:21 PM

Should my side fan be intake or exhaust? It's directly over the CPU.
Right now, I have it as an exhaust fan. I thinking of changing it to an intake so that it can cool parts of the motherboard as well.

Edited by RainbowSix, 14 December 2009 - 09:24 PM.

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#7 ThunderZ

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Posted 15 December 2009 - 08:55 AM

In my experience I have never seen an OEM fan draw away from the heat sink. This includes chip set fans.

I have always followed suit when installing aftermarket coolers.

Cases are designed with airflow in mind. Again, I have never seen front or side mounted fans draw out. Only rear or top mount. However once we start modding them regarding airflow then changing the direction of it may change as well.

FWIW. I buy fan adapters. These are funnel shaped adapters that will allow a larger fan to be mounted in place of the original smaller fan. It also lifts the fan another inch or more higher. In theory this eliminates the dead spot created by the fan hub.

#8 RainbowSix

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Posted 15 December 2009 - 05:12 PM

I changed my side fan to intake and my bios says my CPU is 35C. It was 39C before. Thanks everyone for your input.
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#9 ReviverSoft

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Posted 16 December 2009 - 05:36 PM

I changed my side fan to intake and my bios says my CPU is 35C. It was 39C before. Thanks everyone for your input.


With your heatsink fan sucking in cool air for the proccy, the side fan when changed to intake, will only boost the cooling process.
Hence, the cooler core temperature. :thumbsup:

In my experience I have never seen an OEM fan draw away from the heat sink. This includes chip set fans.


That's true.
Only the dual fan AFTERMARKET coolers function the other way around, where the fan on the side blows cool air onto the heatsink while the fan on top sucks out the warm air.

Edited by ReviverSoft, 16 December 2009 - 05:41 PM.

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