Final answer:
The PCI Express x16 bus architecture is primarily designed for graphics cards, providing high bandwidth for demanding applications such as gaming or professional video tasks.
Step-by-step explanation:
The Peripheral Component Interface (PCI) Express x16 bus architecture is exclusively designed for connecting high-performance graphics cards to a computer's motherboard.
It provides a high-speed data transfer pathway between the graphics card and the rest of the system, allowing for smooth rendering of complex graphics and seamless gameplay.