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PCI Express System Architecture by MindShare, Inc, Ravi Budruk, Don Anderson, Tom Shanley

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Predecessor Buses Compared

In an effort to compare and contrast features of predecessor buses, the next section of this chapter describes some of the key features of IO bus architectures defined by the PCI Special Interest Group (PCISIG). These buses, shown in Table 1-1 on page 12, include the PCI 33 MHz bus, PCI- 66 MHz bus, PCI-X 66 MHz/133 MHz buses, PCI-X 266/533 MHz buses and finally PCI Express.

Table 1-1. Bus Specifications and Release Dates
Bus TypeSpecification ReleaseDate of Release
PCI 33 MHz2.01993
PCI 66 MHz2.11995
PCI-X 66 MHz and 133 MHz1.01999
PCI-X 266 MHz and 533 MHz2.0Q1, 2002
PCI Express1.0Q2, 2002

Author's Disclaimer

In comparing these buses, it is not the authors' intention to suggest that any one bus is better than any other ...

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