What is an Expansion Slot?

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Expansion slots are long narrow sockets in a computer into which an expansion card can be inserted. Nearly all personal computers except portables contain expansion slots for adding more memory, graphics capabilities, and support for special devices.

They are located at the back of the computer, they allow more ports to be add to the computer.

Types of expansion slots are:
ISA
ISA were the first standard for PCs, there are an old technology.
PCI
Peripheral Controller Interface these operate at either 33 or 66 MHz and 64 bits. This utilizes parallel technology. In simpler terms, it is used as an audio or video interface used to make your computer function with more worthwhile options.
PCI-X
This is the latest version of PCI technology operating at 66 MHZ and 64 bits. This also utilizes parallel technology.
PCI Express
This had fewer channels for data but it was much faster than AGP technology. It was cheaper to design and build. This type of slot was much more upgradeable/expandable. It was also serial technology.
AGP
This was a designated slot reserved for graphics cards. It was utilized in a motherboard that would be used in a PC that required high-end graphics processing abilities.
AGP Pro
Used for Mac’s that requires high re-draw capabilities. A good example would be a PC running AutoCAD. Some slots required up to 110W of dedicated power, this would be delivered using a power supply with its own MOLEX.
This had fewer channels for data but it was much faster than AGP technology. It was cheaper to design and build. This type of slot was much more upgradeable/expandable. It was also serial technology.

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