What is a pci slot.

PCI, short for Peripheral Component Interconnect, is a bus, found on motherboards. It is a newer and faster bus than the previous ISA and VESA Local bus. Though, invented in 1993 and that many faster alternatives have been introduced, PCI is still being used as one of the most common interfaces. PCI bus is used for attaching large variety of devices to computer such as network cards, TV tuner cards, modems, sound cards, etc. A typical 32-but PCI bus has the capacity of transferring data at the speed of 133 MB/s and a 64-bit PCI bus can transfer data at the rate of 266 MB/s. Much faster versions of PCI buses are also available, PCI-X and PCI Express for example, which provide and 1GB transfer rate, respectively. Different sizes of PCI cards can be plugged into a PCI bus. There are full-size cards, which have height of 107mm and a depth of 312mm. However, the modern PCI cards are smaller than this size. For example a very commonly used PCI card has width of 0.6 inches, depth 6.9 inches and height 4.2 inches. Half-height cards are also available, which usually have height range between 1.42 inches to 2.53 inches and depth range between 4.72 inches to 6.6 inches. The smallest of all PCI cards have been given a name Mini PCI cards. The standard size of these cards is ¼ of the full-sized cards.

check this.. http://en.wikipedia.org/wiki/Peripheral_Component_Interconnect