VGA and dual-link DVI require active adapters, which do not require dual-mode and are powered by either the DisplayPort connector directly or an external power adaptor (see compatibility with HDMI, DVI and VGA).
VGA and dual-link DVI require active adapters, which do not require dual-mode DisplayPorts. VGA adapters are powered by the DisplayPort connector, while dual-link DVI adapters rely on an external power source (see compatibility with HDMI, DVI and VGA).