Asus fan headers

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Asus fan headers

Postposted on Mon Nov 14, 2011 10:06 pm

Random observation:

The M4A785TD-M EVO apparently ramps the speed of the fan connected to the chassis fan header up and down with the CPU fan speed, even though the chassis fan header is only a 3-pin (non-PWM) header. The PWR fan header does not do this (runs at full speed all the time). Until I figured this out, I actually thought I had a defective fan!

Contrast with the M4A88T-M (a very similar board), where only the CPU fan changes speed with CPU core temp (both the chassis and PWR fans run at full speed all the time).
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Re: Asus fan headers

Postposted on Mon Nov 14, 2011 10:32 pm

As I recall, the M4A785TD-M Evo had two separate fan speed controllers under the Q-Fan setttings in the BIOS -- One for the CPU fan and one for the chassis fan.

I recently passed that motherboard along to my family, but I believe that's how I had it set up.
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Re: Asus fan headers

Postposted on Mon Nov 14, 2011 10:35 pm

JustAnEngineer wrote:As I recall, the M4A785TD-M Evo had two separate fan speed controllers under the Q-Fan setttings in the BIOS -- One for the CPU fan and one for the chassis fan.

I went and looked in the BIOS a little while ago, and only saw one; the single setting seemed to control both fans. Maybe there's a BIOS update that separates the two...
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