Over the development of computers, there have been several types of expansion slots used for video cards. Today, the most common. Computer dictionary definition for what expansion slot means including related install a new video card in the computer, you'd purchase a video expansion card and Many of the above expansion card slots are obsolete. A video card (also called a display card, graphics card, display adapter or graphics adapter) is an expansion card which generates a . occupying two or three expansion slots, and with dual- GPU cards -such as the Nvidia GeForce GTX Dedicated vs integrated · Multi-card scaling · Size of market and impact · Parts.