Asus V2-PH1 - Manual (Page 97)

ASUS Vintage2-PH1 5-33
Power Fan Speed [xxxxRPM] or [N/A]
The onboard hardware monitor automatically detects and displays the
power fan speed in rotations per minute (RPM). If the fan is not connected
to the power fan connector, the specific field shows N/A.
Configuration options: [Ignored] [xxxRPM] or [N/A]
VCORE Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage
The onboard hardware monitor automatically detects the voltage output
through the onboard voltage regulators.