Pci Express Spec Jun 2026

PCI Express (Peripheral Component Interconnect Express), commonly abbreviated as PCIe, is the high-speed serial computer expansion bus standard that serves as the primary communication highway between a computer's processor and its critical hardware components. Since its introduction in 2003, it has effectively replaced older standards like PCI, PCI-X, and AGP, becoming the universal interface for graphics cards, SSDs, Wi-Fi cards, and ethernet adapters. The Evolution of PCIe Generations