cpu fan control from mobo

71monaro · Post by **71monaro** » Sun Nov 05, 2006 3:43 pm

My question is, how do I use a 3 wire fan (as most good ones are) off my 4 pin mobo, with mobo controlling speed and sensing correct rpm? I dont think possible. Then why arent more fans 4 wire (and I dont mean just 4pin molex)My Nexus fan supplier says the realsilent fans are available in 3 or 4 pin but I am assuming when they say 4 pin it is a molex plug, not mobo 4pin? Iread the recent thread titled 4 pin fan. and seemed to be no answer besides buying a JMC fan.
It seems (electrically) an easy mod to add the permanent 12v wire to speed sense circuitry, but has anyone succeeded?

cmthomson · Post by **cmthomson** » Sun Nov 05, 2006 6:26 pm

The P5WD2 supports 3-pin CPU fans directly. In the BIOS, go to the power/monitor page and set the fan mode to DC. The connector is keyed so you can't plug it in wrong.

You can use the BIOS Q-Fan, or use SpeedFan to control the fan speed.

71monaro · Post by **71monaro** » Sun Nov 05, 2006 7:21 pm

This will be for p5b.
Is the cpu and chasis fan speed varied dynamicly with temp sensors?

71monaro · Post by **71monaro** » Sun Nov 05, 2006 7:41 pm

see this thread for further discussion

viewtopic.php?t=35527&highlight=

picture_perfect · Post by **picture_perfect** » Sun Nov 26, 2006 3:30 pm

i have the same problem controlling the zalman 9500 (3-pin cpu fan) on my 4-pin abit board. right now it runs @ 100%. the options arent that great that i can see:

1) worst: attach the 3-pin zalman to one of the 3-pin fan headers which unfortunately, only adjust down to 8v (9500 is still very loud).
2) better: i could use the zalman fan mate but dont really need the clutter. i prefer bios control anyway.
3) best: mount a 120mm nexus to the zalman and use a 3 pin header. even at 8v the nexus would be much much quieter and have bios control. i just need to go and do it i guess.

hope you find a easier solution.