To add a video card to your computer, you have to pick an expansion slot. There have been many kinds of expansion slots over the years so most motherboards. In computing, the expansion card, expansion board, adapter card or accessory card, is a printed circuit board that can be inserted into an electrical connector, or expansion slot on a computer motherboard, backplane or riser card to add Intel introduced the AGP bus in as a dedicated video acceleration solution. Older PCs may sport this expansion slot, but the best video cards use PCI Express. ISA: The most ancient type of expansion slot is the ISA, which stands for (get.