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Abstract
The Peripheral Component Interconnect (PCI) bus found in PC, workstation, and server products has
evolved over time to keep pace with advances in microprocessor and networking technology. This
brief explains how the evolution of the PCI specification from PCI to PCI-X has affected compatibility of
existing PCI adapters and PCI slots. This brief also explains why customers migrating to the latest
generation of HP ProLiant servers may find it cost effective to update some legacy I/O adapters.
Introduction
The PCI Special Interest Group (PCI-SIG) developed the PCI bus specification to overcome impending
bottlenecks with existing interfaces such as the EISA bus, the most widely used I/O interface at the
time. Introduced in 1992 as a 32-bit, 33-MHz interface, the initial PCI bus offered three times the
prevalent EISA bandwidth. The PCI-SIG, of which HP is a contributing member, continues to control
and enhance the PCI bus specification to keep pace with evolving microprocessor and networking
technology. The latest revisions to the PCI bus allow even higher speeds for increased I/O
performance that can complement today’s and tomorrow’s processor speeds.
PCI revisions
Table 1 shows the PCI bus revision history. All revisions are backward compatible, meaning that a
system designed to meet PCI-X specification version 2.0 can support PCI cards built to earlier PCI-X
and PCI revisions, although some restrictions (discussed later in this document) may apply.
Table 1. PCI revision history
Specification
Year
Clock Signaling
level
Peak bandwidth
revision
introduced
supported by slot
PCI 1.0
1992
33 MHz
No slots defined
133 MB/s @ 32 bits, 266 MB/s @
64 bits
PCI 2.0
1993
33 MHz
5 or 3.3 V
133 MB/s @ 32 bits, 266 MB/s @
64 bits
PCI 2.1
1995
33 MHz
5 or 3.3 V
133 MB/s @ 32 bits, 266 MB/s @
66 MHz
3.3 V
64 bits
266 MB/s @ 32 bits, 533 MB/s @
64 bits
PCI 2.2
1998
33 MHz
5 or 3.3 V
133 MB/s @ 32 bits, 266 MB/s @
66 MHz
3.3 V
64 bits
266 MB/s @ 32 bits, 533 MB/s @
64 bits
PCI 2.3
2002
33 MHz
5 or 3.3 V
133 MB/s @ 32 bits, 266 MB/s @
66 MHz
3.3 V
64 bits
266 MB/s @ 32 bits, 533 MB/s @
64 bits
PCI-X 1.0
1999
66 MHz
3.3 V
266 MB/s @ 32 bits, 533 MB/s @
100 MHz
3.3 V
64 bits
133 MHz
3.3 V
400 MB/s @ 32 bits, 800 MB/s @
64 bits
533 MB/s @ 32 bits, 1.07 GB/s @
64 bits
2
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