DFI EL330-DR - Manual (Page 88)

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BIOS Setup
Smart CPUFAN Temperature
This field is used to select the temperature at which the CPU fan
runs at full speed. The temperature will vary within the range of the
tolerance value selected in the field below.
CPUFAN Tolerance Value
This field is used to select the tolerance value of the CPU’s tempera-
ture. The options are 1, 2, 3, 4 and 5. If you selected 3, it allows the
temperature to run 3 degrees higher or lower. The CPU fan will
smartly adjust it’s speed in accordance to the temperature.