Auto Allows control of master GPU fan speed to be automatic or manual. Hints: - When GPU settings synchronization mode is enabled in tab in advanced properties, any changes applied to the master GPU are also applied to all similar GPUs installed in the system. - Fan speed control is not available if graphics card is not equipped with fan controller chip and (or) controllable cooling system. - Depending on button state, automatic fan speed control is performed either at hardware level by dedicated fan controller chip or at software level by %PRODUCTNAME%. - You may disable user interface tooltips via tab in advanced properties.