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PCI Express 4.0: What it is and why it’s important

By Kevin Parrish

Computex 2019 AMD keynote

Nearly two years after its formal introduction, PCI Express 4.0 is finally here. The specification promises higher speeds than the previous generation for internal storage, graphics cards, and more. What is PCI Express 4.0 exactly and why does it matter to you? Let’s take a look without getting too crazy technical.

Peripheral Component Connect (PCI)

To understand PCI Express, we need to start with its predecessor. Intel created the original PCI computer bus in 1992. It replaced the EISA and MCA expansion buses in servers, and the VESA Local Bus in mainstream PCs. A bus is a hard-wired “highway” on a motherboard linking components in a computer. There are many buses serving different purposes, like the Universal Serial Bus supporting printers, mice, and keyboards.

PCI relies on parallel transmission that sends and receives data simultaneously across multiple lines. In contrast, serial transmission sends data just one bit at a time. If both move data at the same speed, the parallel transmission appears “faster” due to the transmitted data amount.

PCI relies on parallel transmission that sends and receives data simultaneously across multiple lines.

The problem with a parallel design is that it requires all lines to be synchronized, limiting data rates and frequency. Moreover, signals …read more

Source:: android authority