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ASUS Support Home Location : Forum > Motherboard > Sabertooth X58  
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  Topic : [Problem]How to change CPU fan speeds in BIOS? New Topic
Xue
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Tech Points : 1
From: United States
Posted:1/29/2011 12:51:00 AM # 1
I have a Sabertooth X58 motherboard and I'm trying to figure out how to lower the fan speeds in the BIOS.  I've played with the settings in the hardware monitor q-fan but the fan never changes speeds.  Surprisingly the speedfan software does lower the fan speeds but it doesn't save my settings.  I'd like to know how I can boot up my computer where the fan speed isn't running at 100 percent.

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Ulrich
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From: United States
Posted:1/29/2011 1:25:00 AM # 2
Hi X..

I expect you have a three wire fan connected to the CPU Fan Header...  is that correct..?  Is the issue with the CPU fan alone.. or all the system fans...?

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
Xue
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From: United States
Posted:1/29/2011 1:34:00 AM # 3
Just the CPU fan and it is 3 wires

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Ulrich
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Posted:1/29/2011 3:13:00 AM # 4
Hi X..

I don't beliee that there is any DC protocal for the CPU fan...  Just PWM.. so that means that 12vdc is always precent.. no voltage variation available.  3wire fans will therefore spin at full speed all the time.

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
Xue
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Posts : 3
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Tech Points : 1
From: United States
Posted:1/29/2011 6:56:00 AM # 5
Sorry, actually upon closer inspection, the CPU fan uses a 4 pin connector.

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Magnetar
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Posted:1/29/2011 7:22:00 AM # 6
If you use the ASUS Fan Xpert program, provided with the SaberT, or available for download from the Download tab on the SaberT information page, you'll be able to control your PWM fan.

There are several fan profiles available as well as a user-defined one.  I use this all the time and it works great.  One glitch with it in my case is that ASUS has decided that a CPU cooling fan must run at a minimum of 600 RPM, or it complains when the PC is booted.  My CPU coolers fan will run below that speed when at idle or low CPU load.  This is a small annoyance that may not apply to you.

Try Fan Xpert, I like it.

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