You plug bits of circuit board into slots to gain extra functionality.
The price of 8 expansion slots equals the price of 7 expansion slots.
PCI X stands for Peripheral Component Interconnect Extended. It is used for expansion of 32 bit PCI bus slots. The slots are used to enhance the capabilities of the motherboard.
expansion slots are the slots that are located on the mother boards of the computer and at the left side of the south bridge.
On an AT motherboard, the CPU will be placed in front of the expansion slots
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Expansion features, of course (that is why they are called expansion slots).Boards (sometimes called daughterboards) are plugged into these slots to add the needed hardware for features not originally included in the computer. Additional driver software is usually required to support these boards (some OSs can automatically identify the new boards and load the driver software automatically, others require that the user do this manually).
Unless the motherboard was specifically designed to support a riser card, you cannot add additional expansion slots to it.
PCI AGP PCI-E
You plug bits of circuit board into slots to gain extra functionality.
Historically laptops used PCMCIA expansion slots, but these days this has generally been depreciated in favour of USB peripherals.
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