Below is a table showing the different buses/card slot types and their Normal PCI is Parallel, and as such all data goes in one direction around the loop.
It is technologically superior to the older slots in every way. PCI -Express can be referred to using various names: PCI -Express, PCIe, or PCI -E. They all mean.
Which types of PCI extension boards and PCI slots are available and which . The model name of all PCI boards starts always with followed by QuadBRI.
All about pci slots - free download