What Are Expansion Slots on a Computer Case?

An expansion slot is a socket on the motherboard that is used to insert an expansion card ( also known as a peripheral card or adapter card ) . Expansion slots are generally classified as ISA, PCI, or PCIe, and the standard of the slot is determined by the design of the motherboard.

The expansion card connects to the motherboard via an expansion bus.

There are three types of expansion slots: ISA, PCI, and PCIe. ISA slots are the oldest and least common type. They were used on early PC motherboards for connecting things like modems and sound cards. Today, you’re unlikely to find an ISA slot on a new motherboard.

PCI slots were introduced in 1992 as a way to connect devices to the computer without using the ISA bus. They’re commonly used for connecting sound cards, network cards, and other types of peripherals. PCIe slots were introduced in 2004 and are used for graphics cards and other high-speed devices.

The number of expansion slots on a computer case is determined by the size of the case and the type of motherboard that’s being used. Smaller cases may have only one or two expansion slots, while larger cases may have six or more.

Most motherboards have four or more expansion slots.

Expansion slots are important because they give you the flexibility to add new features to your computer as needed. For example, if you want to add a new graphics card to your computer, you’ll need an available PCI Express slot.

If you want to add a TV tuner card, you’ll need an available PCI slot. And if you want to add a modem or sound card, you’ll need an available ISA slot.