Everything you need to know about PCI Express bus.
"The processor communicates with other peripherals in the PC through a path of data called bus. Since the release of the first PC, in 1981, up to the present day, several types of bus have been developed in order to allow the communication between the processor and input and output peripherals. We can name the following buses already launched.." Read on at HardwareSecrets.
PCI Express Bus Tutorial
