Alternatively known as a bus slot or expansion port, an expansion slot is a connection or port inside a computer on the motherboard or riser card. It provides an installation point for a hardware expansion card to be connected. For example, if you wanted to install a new video card in the computer, you'd purchase a video expansion card and install that card into the compatible expansion slot.
Computer expansion slots
Below is a listing of expansion slots commonly found in a computer and the devices associated with those slots. Clicking on any of the links below provide you with additional details.
- AGP - Video card.
- AMR - Modem, sound card.
- CNR - Modem, network card, sound card.
- EISA - SCSI, network card, video card.
- ISA - Network card, sound card, video card.
- PCI - Network card, SCSI, sound card, video card.
- PCI Express - Video card, modem, sound card, network card.
- VESA - Video card.
Many of the above expansion card slots are obsolete. You're most likely only going to encounter AGP, PCI, and PCI Express when working with computers today. In the picture below is an example of what expansion slots may look like on a motherboard. In this picture, there are three different types of expansion slots: PCI Express, PCI, and AGP.
A peripheral device connects to a computer system to add functionality. Examples are a mouse, keyboard, monitor, printer and scanner. Expansion slots (#4) on the motherboard make it possible. 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 this) Industry Standard Architecture. That’s because it never really had a name until another, better type of expansion slot came along.
How many expansion slots does my computer have?
- A computer system comprising: a computer input device; an expansion slot in said input device; and a storage device in said expansion slot. The computer system recited in claim 1 wherein said storage device is a mini disk drive. The computer system recited in claim 1 wherein said input device is a mouse.
- An expansion card, sometimes known as a PCI (peripheral component interconnect) card, is a circuit board that connects devices such as network interface cards, graphic cards, sound cards, and modems. Expansion cards fit into slots on the motherboard called expansion slots.
- In most cases, the expansion slots are also present at the back or the sides of the machine, which makes it very easy for the user to connect any additional peripherals with ease. These slots are more commonly found in desktops, since the CPU unit has the space to house many such slots.
Every computer motherboard is different, to determine how many expansion slots are on your computer motherboard identify the manufacturer and model of the motherboard. Once you've identified the model of motherboard, you can find complete information about the motherboard in its manual.
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Adding additional expansion slots for older motherboards could be accomplished by using a riser board, which would add several ISA or PCI slots. Today, riser boards are rarely used with motherboards, as there is limited need for additional expansion slots with modern motherboards.
What type of expansion slots are on my motherboard?
Expansion Slots Peripheral Devices Device
As mentioned above, every motherboard model is unique, so to determine the type of expansion slots on the motherboard, consult the board's specifications and owner's manual. You can also open the computer case and visually examine the motherboard.
Why do computers have expansion slots?
Computers have expansion slots to give the user the ability to add new devices to their computer. For example, a computer gamer may upgrade their video card to get better performance in their games. An expansion slot allows them to remove the old video card and add a new video card without replacing the motherboard.
What is the most common expansion slot today?
Today, the most commonly used expansion slot used and found on computer motherboards is the PCI Express expansion slot.
Does a laptop have an expansion slot?
Laptops do not have expansion slots like a desktop computer. However, some laptops do have PC Cards that can be inserted into the side of the laptop. They may also have a Cardbus slot for an ExpressCard to be added.
Related expansion slot pages
Expansion Slots Peripheral Devices Types
Expansion, Expansion card, Motherboard terms, Seated