Where do I get the Asus Fan Speed Control utility I have heard about?

[Wiz]

I'd like to control the speed of my fan, it's gone up & down from about 2500 rpm up past 5000 rpm - I want to set it to one speed & leave it there. It's at 2500 now, I turned off Qfan in bios so it's staying at 2500 which is a bit slow for my OC

 

[mechBgon]

Turning off Q-Fan should make it run at full speed, not reduced speed. Something is Messed Up?. What fan is this, exactly?

 

[Wiz]

it's the retail fan

I tried hooking up directly to yellow/black & still only get about 2500 rpm.
That's probably the "full speed" so the real question is why it ran at 5000+ rpm for a while there?

 

[mechBgon]

Wiz, I am not psychic... the retail fan from what? And how do you know it was at 5000rpm, by noise or by software, or both?

 

[Wiz]

sorry -

it's a P4 2.8 Prescott with the retail HSF

I am using Asus Probe - when I heard the fan speeding up (sounded like a tiny engine revving up) I checked probe & saw the rpm speed up to 5000+
Now I want to know how it did this so I can make it run a tad faster all the time. 2500 isn't that great for overclocking & running two instances of seti

 

[mechBgon]

I believe the retail Intel heatsinks still use a thermally-regulated fan. My speculation on the event you observed:

• You plugged your thermally-regulated Intel fan into your mobo header. By default, it uses its thermistor to run the fan at about 7/12 of its full speed.
• With Q-fan enabled, your mobo header looks at your CPU temperature, sees that it's pretty low, and cuts down the voltage to the CPU fan.
• Now the CPU fan is trying to run at 7/12 of a voltage that Q-fan just cut back to about 8 volts. The CPU fan stalls.
• With the CPU fan stalled, the processor temperature begins to climb.
• After a while, Q-Fan notices the high temperature. It waits for its default timeout period, then begins kicking up the voltage to the CPU_FAN header again to counteract the rising temperature.
• Eventually the mobo header hits a voltage that's enough to un-stall the Intel fan. The fan's thermistor sees very high temperatures and throws the fan into overdrive for a while.
• Temperatures subside and the CPU fan kicks back down to its usual temperature.

Bottom line: you don't want two layers of voltage regulation going on. If your Intel heatsink's fan has a little green thermistor sticking out of the fan motor's hub, nip it off with a diagonal cutter and the fan should run at full speed all the time. Or pick up a better cooler, period.

 

[Wiz]

MechBgon - thanks again man, you're the best!