PCI Bus

btandard

Bus Width

Clock

Transfer

PCI 2.3

32 Bit

33 MHz
66 MHz

133 MB/s
266 MB/s

PCI 64

64 Bit

33 MHz
66 MHz

266 MB/s
533 MB/s

PCI-X 1.0

64 Bit

66 MHz
100 MHz
133 MHz

533 MB/s
800 MB/s
1066 MB/s

PCI-X 2.0 (DDR)

64 Bit

133 MHz

2132 MB/s

PCI-X 2.0 (QDR)

64 Bit

133 MHz

4264 MB/s

PCI Express

1 Lines, 8 Bit

2.5 GHz

2.5Gbps per direction (Lane)

PCI Express

2 Lines, 8 Bit

2.5 GHz

5 Gbps per direction (Lane)

PCI Express

4 Lines, 8 Bit

2.5 GHz

10 Gbps per direction (Lane)

PCI Express

8 Lines, 8 Bit

2.5 GHz

20 Gbps per direction (Lane)

PCI Express

16 Lines, 8 Bit

2.5 GHz

40 Gbps per direction (Lane)

PCI Express

32 Lanes, 8 Bit

2.5 GHz

80 Gbps per direction (Lane)

http://www.interfacebus.com/Design_Connector_PCI_Express.html
 

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