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PCI Express Technology
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“Formerly known as 3GIO, PCI Express is the open standards-based successor to PCI and its variants for server- and client-system I/O interconnects. Unlike PCI and PCI-X, which are based on 32- and 64-bit parallel buses, PCI Express uses high-speed serial link technology similar to that found in Gigabit Ethernet, Serial ATA (SATA), and Serial-Attached SCSI (SAS). PCI Express reflects an industry trend to replace legacy shared parallel buses with high-speed point-to-point serial buses.
The new bus technology allows the PCI Express transmission rates to keep pace with processor and I/O advances for the next 10 years or more. Systems with PCI Express will begin appearing around the middle of 2004.”