(PCI-SIG, Beaverton, OR, www.pci-sig.com) An industry consortium founded in 1992 that owns and maintains all PCI technologies. It also sponsors workshops and technical conferences. Standing for PCI Special Interest Group, more than 900 member companies are involved. Following is a comparison of PCI bus speeds. See PCI, PCI-X and PCI Express.
BANDWIDTH OF PCI-SIG TECHNOLOGIES
This data courtesy of PCI-SIG.
Year Bus Size Clock Date Rate
Ver. Intro (bits) Speed MBytes/sec
PCI - Parallel Shared
1.0 1992 32 33 Mhz 133
2.0 1993 32/64 33 Mhz 133/266
2.1 1995 32/64 66 Mhz 266/533.3
2.2 1998 32/64 66 Mhz 266/533.3
2.3 2002 32/64 66 Mhz 266/533.3
PCI-X 1.0 Parallel Shared
66 1999 32/64 66 Mhz 533
Data Rate
Gbytes/sec
PCI-X 1.0 Parallel or Shared or Point-to-Point
133 1999 32/64 133 Mhz .5/1.06
PCI-X 2.0 Parallel or Point-to-Point
266 2002 16/32/64 266MTs .5/1.06/2.13
533 2002 16/32/64 533MTs 1.06/2.13/4.26
PCI Express (PCX) - Serial Switched Point-to-Point
2002 x1 "2.5 Gbps .5
2002 x2 per 1.0
2002 x4 lane 2.0
2002 x8 per 4.0
2002 x16 direction" 8.0
2002 x32 16.0
MTs = megatransfers per second (see MT/sec).
Megatransfers are used when megahertz is not
accurate (not actual clock cycles).
PCI-X 266 is running at 133 MHz, but data are
double clocked. PCI-X 533 is quadruple clocked.
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