PCI-Z turns to be a useful tool when you need to find out what kind of PCI device you have mounted into the motherboard. In addition to this, several other pieces of information about the PCI-E, PCI-X device will also be displayed, such as the vendor or the working frequency. This will help you identify the proper driver for that specific PCI device, without having to open the computer, unplug the card and hope to find valuable data printed onto it.
The software is able to tell you the vendor, the device classes and several other pieces of information by interrogating a list of numeric codes, also known as a public repository. As to each device is given a different code, the program will translate it into human friendly data.