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 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.