From Fan speed to total voltage, you can view any and all of the current fans.įirst of all, you have to identify which temperature sensor is which. When Speedfan is in an open window, you can see a whole lot more. When minimized, a temperature reading is showed on the button right of the desktop. The main viewing purpose of SpeedFan is to show its user what's going on with their machine. SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips.