atx motherboard with PCI slots

 ATX motherboard with pci slots

 

What is PCI?
PCI: A standard interface of a PC for connecting internal hardware.(PCI=Peripheral Component Interconnect)
History of PCI: Introduced by Intel in 1992, popular from the late 90s, and now mostly legacy, replaced by PCIe.
Function of PCI : Allows users to install cards (sound, network, video, ...) to add or improve features on a PC.

How to identify (PCI,PCIe) ?

PCI: Older, typically shorter, white or brown slots.
PCIe (PCI Express): Vary in length; x1 (short), x4, x8, x16 (longest for graphics).

 

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