What fan modes are supported and how do I switch between them?

The motherboard supports PWM (Pulse Width Modulation) mode and DC mode for fan connectors. PWM mode provides constant 12V output and adjusts fan speed with control signals, while DC mode controls speed by changing voltage. Auto mode connectors can automatically detect both modes. You can switch between PWM and DC modes and adjust fan speeds in BIOS > Hardware Monitor, with gradient points allowing fan speed adjustment based on CPU temperature.