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PCI Express* Ethernet Networking White PaperPCI Express*, a new third-generation input/output (I/O) standard, allows enhanced Ethernet network performance beyond that of the older Peripheral Component Interconnect (PCI) and PCI Extended (PCI-X) desktop and server slots. The higher performance of PCI Express derives from its faster, serial-bus architecture, which provides a dedicated, bi-directional I/O with 2.5-GHz clocking, versus the slower 133-MHz parallel bus of PCI-X. This white paper provides an overview of the new PCI Express bus architecture and the benefits it brings to Ethernet network connectivity for desktops, workstations and servers.AbstractWith ever-increasing network traffic, bottlenecks are inevitable in the existing parallel, multi-drop architecture of the Peripheral Component Interconnect (PCI) bus and its second-generation version, the PCI Extended (PCI-X) bus. Today, those bottlenecks can be alleviated with the much higher performance of the third-generation PCI Express* architecture, which uses a 2.5-GHz clocked serial I/O structure to provide higher bandwidth and far better scalability than its predecessor I/O architectures. This white paper provides an overview of the new PCI Express bus architecture and the benefits it brings to Ethernet network connectivity for desktops, workstations and servers.IntroductionThe venerable first-generation PCI standard and its second-generation relative, the PCI-X bus, have served well over the years as Input/Output (I/O) architectures for PCs and network servers. While PCI and PCI-X will continue to provide service for some years to come, their usefulness will continue to diminish. The reasons are quite simple—PCI and PCI-X are too bandwidth and scalability limited for much of today’s computing and networking needs.Read the full PCI Express* Ethernet Networking White Paper Case Study.
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