||How does PCI Express differ from PCI?
PCI Express is a new standard that overcomes the speed limitations of PCI, pushing the data rate to 2.5Gbps and beyond.
The bus architecture of PCI has restricted its data rate because the skew between the clock and data lines becomes excessive as the rates increase.
PCI Express (also written as PCIe) replaces PCI's bus architecture with a serial I/O structure that uses a clock, embedded in the data, to solve the skew problem.
In addition to providing faster data transfer rates, PCI Express simplifies PCB design and lowers overall cost because it uses only four signal pins, compared to the 49 used with PCI.
PCI Express also comprehends different data types, provides extended configuration attributes, offers power management and quality of service features, supports hot plug and hot swap, and provides superior data integrity and error handling.