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Asus P6T: No real speed control ?

Forum Motherboards & Memory : Asus - Asus P6T: No real speed control ?

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machone   03-22-2009 at 12:19:35 AM

I've recently built an i7-920 system around an Asus P6T motherboard, Noctua NH-U12P CPU cooler, Antec 300 chassis (built in rear and top fans) and Enermax UC-12EB front chassis fans. It runs Vista 64-bit, and everything works great EXCEPT one thing:

First, the Noctua CPU cooler comes with two NF-P12 3-pin fans. I've got one plugged into the motherboard CPU Fan connector (there's only one), the other into one of the motherboard's Chassis fan connectors. One of the Enermax chassis fans is plugged into the remaining motherboard Chassis fan connector.

Trouble is, *none* of the speed control seems to really work. The 3-pin CPU fan runs at 100% speed regardless of either BIOS or SpeedFan or Asus speed control software setting. All see the RPM just fine, but no control. Contacting Asus confirmed that the 4-pin motherboard connector only supports 4-pin fans. There is no way to set the BIOS to control a 3-pin fan. (You wouldn't know this from the wording on the Noctua website, for what that's worth).

However, the motherboard's chassis fan connectors are both 3-pin and are supposed to be controllable too. I wish that were true. Neither the 2nd Noctua fan, or the Enermax fans can really be controlled. I can turn them on(anything >0%) or off (0%), but regardless of percent setting, the fans both operate at the same speed. I've observed this behavior via BIOS, SpeedFan, and Asus speed control software settings.

Has anyone else observed this problem? Is there some kind of "secret" BIOS setting that I'm missing? (I've enabled and disabled speed control in BIOS and results seem same). Do some kinds of fans just resist being speed controlled and I just picked the wrong ones?

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halcyon   03-22-2009 at 02:38:47 AM
- 0 +

Yes, I'm sure many of us have had that same problem. I didn't give it another thought...I just put in a Scythe fan controller and forgot about it.

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Hamidnia101   05-13-2009 at 03:39:21 AM
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I have the same problem, any fix to this?

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N D   05-15-2009 at 12:44:18 PM
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- I put screen brightness down to 30% (Via Energy Saving Plan (Balanced)- so it stopped overheating but not completely.
- I then installed SpeedFan!!! and set 4 instances' 'desired' temperature to 15C (Automatic Speed Adjustment).
- So now when I browse or use Photoshop and the like my notebook is completely cold and small fans are striving for perfection (ASUS F3JSeries)
- BUT I can't believe I got this idiotic lite version bios where it says nothing about the fans at all - cause for this price I expect to control my f fans !!!!

Reply to N D
N D   05-15-2009 at 12:50:44 PM
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P.S. And to imagine there is no SpeedFad - what do you do? - Take it back to the shop innit?

Reply to N D
j_bob   10-20-2009 at 09:54:38 PM
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I'm having this problem too, its VERY loud

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