comparison of PCI bus speeds

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 33Mhz 133
2.0 1993 32/64 33Mhz 133/266
2.1 1995 32/64 66Mhz 266/533.3
2.2 1998 32/64 66Mhz 266/533.3
2.3 2002 32/64 66Mhz 266/533.3
PCI-X 1.0 Parallel Shared
66 1999 32/64 66Mhz 533
Data Rate
Gbytes/sec
PCI-X 1.0 Parallel or Shared or Point-to-Point
133 1999 32/64 133Mhz .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 ).
Megatransfers are used when megahertz is not
accurate (not actual clock cycles).
PCI-X 266 is running at 133MHz, but data is
double clocked. PCI-X 533 is quadruple clocked.