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Fan speed in UEFI

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Mt17249 View Drop Down

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    Posted: 29 Sep 2015 at 12:03pm
I am wondering if anyone has an actual explanation of the different cpu and chassis fan speed settings in the UEFI. I was playing around with the custom settings and it didn't seem to matter much. My fans were always kinda loud on my cpu cooler. That is until I put it into silent mode. Now I cant tell if they are even spinning. I was hoping someone has a good technical explanation of the different modes.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 29 Sep 2015 at 1:40pm
It would be helpful to know which ASRock board you are referring to, but given your description it seems like a newer model.

If you installed and ran your board's ASRock utility program (depending upon the board, AXTU, A-Tuning, F-Tuning, F-Stream, etc), and went into the FAN-Tastic Tuning feature, you could see a graphical display of the fan speed percentage for a given temperature of the CPU or mother board (mother board temperature monitoring available on some newer boards.) For example:

The selected pre-defined or user defined custom fan speed "curves" or graphs will be shown for each of the fan headers by this feature. You can modify the curve by the usual mouse drag and drop capability, by clicking on the large dots on the curve.

As you can see, the X axis is CPU temperature in degrees C, and the Y axis the fan speed percentage. You must run the FAN Test by clicking its button above the percentage and Fan Speed table to the right of the fan speed curve, in order to know what percentage correlates to a specific fan speed for the fans you are using.

Since there are zero standards for a fan's speed (RPM) at different voltages (three pin fans) or a PWM percentage (four pin PWM fans) for a certain speed, ASRock engineers supply a voltage or PWM percentage range that will accommodate the majority of fans available. It is up to us to run the fan test and learn what fan speed (RPM) we get at each of the ten percentage levels. The fan speed is a relative reference for us. You might know your CPU fan is loud above 1,200 RPM, so you can adjust the curve to keep it quiet most of the time. Or you may know you need a specific fan speed to maintain the CPU temperature below a certain level.

The pre-defined fan speed profiles like Silent or Performance are different percentage vs temperature curves for a purpose. They are a convenience for the user that does not want to create a custom fan speed curve.

Your board's ASRock utility program also shows the speeds of the fans connected to its headers, CPU and mother board temperatures, and other data in the System Info feature.

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