INTRODUCTION

When look back to history we can find so many advancement in technology day today life. When refer to the technology, can find lot of development between every stage. In communication and computer sector the growth is drastic change, people can communicate any where in the world in few seconds because of technical advancement. There are certain times in the evolution of Technology for every generation. Because of technology revolution a new input/output architecture, PCI Express allows computer to process far beyond the limit when compared with the existing technology. The term PCI - Peripheral Component Interconnect.PCI Express is the third generation I/O interconnects.PCI Express communicate the devices simultaneously by implementing dual unidirectional paths, this makes the protocol high speed and low voltage.

The three main technologies,

· PCI

· PCI- X (Derivative of PCI)

· PCI- Express

PCI-X is not the abbreviation of PCI Express. PCI-X evolved from PCI.