AAEON EMB-Q77A - Manual (Page 53)

3-17 Chapter 3: BIOS setup
CPU Fan Min. Duty Cycle(%) [60]
Use the <+> and <-> keys to adjust the minimum chassis fan duty
cycle. The values range from 60% to 100%. When the chassis
temperature is under 40ºC, the chassis fan will operate at the
minimum duty cycle.
3.4.4 CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage
The onboard hardware monitor automatically detects the voltage output through
the onboard voltage regulators. Select Ignore if you do not want to detect this item.