DFI AR100-DR - Manual (Page 64)

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BIOS Setup
CPU Fan Temperature
Selects the temperature of the CPU.
CPU Fan Tolerance Value
This field is used to select the tolerance value of the CPU’s temperature. The op-
tions 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.