Courtesy of Anritsu
Before PCI Express (PCIe) became the standard for computer hardware interfaces, systems relied on parallel buses, such as PCI (Peripheral Component Interconnect) and AGP (Accelerated Graphics Port). These older standards worked on shared bus architectures, where multiple devices had to compete for bandwidth, leading to bottlenecks. The introduction of PCIe marked a revolutionary shift from parallel to serial communication, offering superior performance, scalability, and flexibility.