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Difference between PCI-E and PCI-X
  • Last Updated : 29 May, 2020

1. Peripheral Component Interconnect eXtended (PCI-X) :
PCI-X or Peripheral Component Interconnect eXtended is a local computer bus that comes alongside an expansion card. It is the extended version of Peripheral Component Interconnect that has higher bandwidths. It was introduced in the year 1998 by IBM, HP, Compaq and had a feature of supporting higher clock speeds and hot swapping.It is designed in parallel and has width of 64 bits. It was later replaced by other version named PCI-E due to its slow functioning.

2. Peripheral Component Interconnect Express (PCI-E) :
PCI-E is a replaced version of Peripheral Component Interconnect eXtended(PCI-X) introduced in the year 2003 by Intel, Dell HP and IBM. PCI express is a serial bus which connects graphic cards, Wifi, hard drives and other hardware devices. It works faster than PCI-X, has less input and output pin count making it work better than PCI-X. This version had many features than the older ones.



Difference between PCI-X and PCI-E :

S.NO PCI-X PCI-E
1. PCI-X is a computer bus that connects hardware devices and has an expansion card. An advanced version of PCI bus that connects graphic ports, Wifi and other devices.
2. It was introduced in the year 1998 by IBM, HP and Compaq. It was introduced in the year 2003 by Intel, Dell, HP and IBM.
3. It is a parallel bus interface It is a serial bus interface.
4. PCI-X is the abbreviated name for Peripheral Component Interconnect eXtended. PCI-E is the abbreviated name for PCI Express.
5. It works slower. It works faster.
6. PCI-X provides a slower data rate PCI Express provides faster data rate.
7. The PCI-X has longer slots The PCI-E has shorter slots.
8. The speed of a PCI-X slot is upto 1064MB/s. The speed of a PCI-E slot is upto 16 GB/s.
9. It has less features. It has more features.
10. The width of PCI-X is about 64 bits. The width of PCI-E is 1 per lane

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