Re: P5P800 Q-Fan with 3-pin fan

In article <20060408114732.BEC.3.NOFFLE@xxxxxxxxxxxxxxxxxxxxxxxxx>, Eric
Wick <ericwhh@xxxxxxxxxxx> wrote:

Hello,

got my new P5P800 and will use the q-fan option on it. My cpu fan is a
enermax uc-9fab-b with only 3-pins (intel boxed cooler with suction
duct to backside). The 4-pin cpu_fan connector on the board shows me

GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM

My fan only use the first 3 pins an get always full 12v power, the q-fan
shows no reaction.

Question: Is it possible to plug CPU FAN IN to CPU FAN PWM or will the
0.44A fan burn something down? The user guide tells me that fans up to
2A can be connected, but not if CPU FAN PWM got this power.

Bye Eric

Plug the three pin fan to (GND, CPU_FAN_PWR, CPU_FAN_IN).
The PWM signal is only intended for the Intel retail fan,
and most fans you can buy at the computer store will not
be equipped with PWM. Thus, if the fan is not the Intel
retail one, you'll be using DC control instead of PWM.

In section 4.5.6 of the manual:

CPU Q-Fan Control [Enabled]
CPU Q-Fan Mode [DC]
CPU Fan Ratio [60%] (makes fan slow when CPU is cool)
CPU Target Temperatire [50C] (temp where fan speeds up)

The fan should run at a slower speed, until the CPU silicon
die gets to 50C. Then the fan should speed up. The response
curve should look something like this:

http://web.archive.org/web/20030408094818/http://usa.asus.com/products/mb/qfan.htm

Experiment with the settings until you get some quiet.

If the fan has a low-medium-high switch, set it to high
so that Q-Fan is fully in control. If the 60% setting is
still not making the fan slow enough, reduce the setting
of the low-medium-high switch.

Use Prime95 (mersenne.org) torture test to heat up the
processor. Make sure that Q-Fan is able to keep the
CPU temperature within the target temperature range,
when the CPU loading is 100% for long periods of time.

Paul
.

Relevant Pages

  • Re: a8n-sli cha1 fan no go go
    ... I've just disable Q-Fan, and both of my case fans ... And the CPU fan is not as loud as it was when I first ... Whether you're using Q-fan or a hardware fan controller, ...
    (alt.comp.periphs.mainboard.asus)
  • Re: XP SP2 hangs at "Windows is Shutting Down..."
    ... > I did have an overheating problem before. ... The CPU fan quit on me. ... the file and make a bootable floppy or cd with it. ...
    (microsoft.public.windowsxp.general)
  • Safe Mobo and Hd Temps, Relying on Heatsink Alone?
    ... Hardware newbie Qs on component temperatures. ... and speed fan) on an Asus M2V Mobo, a passive Ati X300 video card, 4 GB ... CPU fan only kicks in, should the machine start heating seriously. ... Howabout the HD and Mobo temps, though, what is ...
    (comp.sys.ibm.pc.hardware.systems)
  • Re: Driver responsible for CPU fan control?
    ... When you know for certain that there are no manufacturer supplied utilities or hardware that may be causing the problem you can then start inquiring of Vista. ... When turning on the laptop in a cold state, the CPU fan starts for 1 or 2 seconds and then stops again. ... Then the system (Windows Vista) boots. ...
    (microsoft.public.windows.vista.general)
  • [opensuse] Interesting CPU Fan Noise Observation
    ... Recently I noticed the CPU fan noise quite a bit more than usual. ... CPU Fan: 5338 RPM ...
    (SuSE)