PCIe 4.0: A Quick Primer on New Features
‘Big Data’, ‘IoT’, ‘Mobile’, ‘Networking’ and ‘Storage’ applications are the key drivers for next generation high-performance systems. To meet the bandwidth requirement of the emerging applications, it was required to either increase the lane width or speed. Increasing the lane width isn’t cost effective and thus increasing speed is the best viable option. PCIe 4.0 has doubled the per lane throughput to 16GT/s, compared to 8GT/s for PCIe 3.0, delivering higher performance without increasing the lane width.
PCIe 4.0 architecture is backward compatible to previous generations of PCIe. Devices designed for previous generations will still operate correctly with the new technology. The figure below shows the evolution of PCIe specifications.
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