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AMI BIOS Smart Fan Speed Control

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July 7, 2009 4:53:38 PM

Hello! This is my first post on Tom's Hardware, but I expect myself to contribute to the site by both asking questions and answering them as well. So here goes my first question:

I am wondering what the following words mean and what they do in an American Megatrends BIOS under the PC Health status, then under the Smart Fan Function.

- SMART Fan Control

- SMART Fan PWN value

- SMART Fan start TEMP. (°C)

- DeltaT1

-SMART Fan Slope PWM value

If anyone knows any of this, I will be very happy to say the least! THANK YOU
a c 435 V Motherboard
July 7, 2009 8:46:05 PM

You can enable the smart fan control. I adjust all the rest of the settings to the lowest possible number, then slowly increase them one by one until you can hear the cpu fan. I set the start temp at around 40 celcius. I have a total of 4 fans in my case counting the 2 on the power supply, and I can barely hear any noise. I use a zalman fan mate rpm adjuster for the rear case fan. The cpu fan will respond to the above settings if it is a 4 pin design. 3 pin designs won't slow down and require the rpm adjuster.
July 7, 2009 8:57:19 PM

i see. i normally do the same things. Do you know what those words mean?
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September 3, 2009 11:47:19 PM

My BIOS is AMI R01-A3, April 2009.

Sounds like I have a similar setup, but the only thing I can change is the SMART enable/disable. My CPU fan only turns at 1225 RPM. I want to speed it up. Here are my values:

*SMART control: Enabled (that's the only one that's not grayed out)
*SMART fan start PWM value: 28
*SMART fan start Offset (-): 30. (I know that's the adjustment from the temp sensor under the CPU, because the CPU has no internal sensor. So the offset is just a good guess at what the real temp is.)
*CPU Delta T: Plus 3 (I know what delta n is mathematically, but don't know what it refers to here)
*Fan1 slope PWM va1/1 unit: 5 (???got me by the ass. I'm sure PWM is pulse width modulation, which I've worked with in machinery)

Again, these are all grayed out. I can change nothing but the SMART on and off.

My BIOS is AMI R01-A3, April 2009.

I just stumbled onto this thread while searching, anybody still hanging out around here? Hope so, I could use some ideas.

Rusty
September 4, 2009 1:52:22 AM

thank you for the help!
September 4, 2009 2:23:04 AM

That wasn't much info for you, but glad it helped though. Any idea about what to do to help my predicament?

I guess I should start a thread of my own to get more views.
!