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Which direction should the CPU fan blow?


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#1
tomdrayson

tomdrayson

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Hi, I can't really find a conclusive answer on this. I have an Intel Core 2 Duo E6700 processor with the stock heatsink and fan; does the fan blow warm air away from the heatsink, or does it blow cooler air down into the heatsink? Also connected to that question: - I am fitting a side case fan, so which way should that blow, towards or away from the CPU/motherboard?

Many thanks
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#2
jaxisland

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Well here is what I have always done. The cpu fan should be blowing warm air away from the CPU. So that fan should be blowing away from it.

The other fans I usually have a big one in the back under the power supply blowing out of the case, one in the front of the case blowing air inside the case, and the one on the side blowing out of the case away from the cpu.

Here is a small diagram

Edited by jaxisland, 30 August 2007 - 12:53 PM.

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#3
tomdrayson

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OK, I already have 2x12cm case fans, one low at the front and one high at the back.
I have an ASUS motherboard which uses something called Q-Fan, which is supposed to adjust the CPU fan speed according to the temperature. I have set it to "Performance" mode which is supposed to be the coolest, and my Core 2 Duo is at 51 degrees at idle with the CPU fan speed at around 850rpm. Is something wrong here - I don't think I trust Q-Fan... How should I be regulating my CPU fan? Do most people just leave it on max?
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#4
jaxisland

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With the low cost of fans today I run mine at max speed and leave it there. If you dont trust it just set it manually.
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