Peripheral Component Interconnect (PCI) is a computer bus standard used for attaching hardware devices to a computer’s motherboard. It defines the physical and electrical specifications for the connection and communication between peripheral devices and the central processing unit (CPU) or other components within the computer.
PCI slots on the motherboard are used to physically connect PCI-compatible expansion cards. These slots come in different versions, such as PCI, PCI-X (Extended), and PCI Express (PCIe), each with varying speeds and capabilities.
PCI bus speeds have evolved over time, with newer versions offering higher data transfer rates compared to older versions. For example, PCI Express (PCIe) is the latest standard and offers significantly faster data transfer rates than traditional PCI.
While newer computers often use PCIe for expansion cards, older systems may still include traditional PCI slots. However, due to its slower speeds compared to newer standards, traditional PCI is less commonly used in modern computers for high-performance devices.