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PCIe 5.0 vs PCIe 6.0 | Difference between PCIe 5.0 and PCIe 6.0

This page compares PCIe 5.0 vs PCIe 6.0 and mentions difference between PCIe 5.0 and PCIe 6.0.

Introduction:
• PCI-e stands for PCI Express which is successor to PCI and PCI-X bus.
• It uses serial connection unlike PCI which uses parallel connection.
• PCI express evolutions are PCIe 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 (planned).
• Let us compare PCIe 5.0 vs 6.0 with respect to line code, transfer rate, bandwidth etc.

PCIe, PCI Express

The PCIe interface supports hot plugging and uses point to point or shared switch topology. The figure depicts serial interface connection used by PCIe devices to communicate with the switch.

PCIe 5.0 | PCIe Gen 5 interface

Following are the features of PCIe 5.0 or PCIe Gen 5 interface type:
• Introduced in the year 2019.
• It is backward compatible with previous PCIe Gen 1/2/3/4.
• PCIe 5.0 uses line code 128b/130b.
• It supports transfer rate of 32.0 GT/s.
• It supports interconnect bandwidth of 32 Gb/s.
• It supports bandwidth lane direction of ~4 GB/s.
• It supports total bandwidth for x16 link of ~128 GB/s.

PCIe 6.0 | PCIe Gen 6 interface

Following are the features of PCIe 6.0 or PCIe Gen 6 interface type:
• It has been planned to be introduced in the year 2021. The draft specifications are released on 24 Feb, 2020.
• PCIe 6.0 is backward compatible with previous PCIe generations.
• PCIe 6.0 uses PAM-4 (four level pulse amplitude modulation) with FEC instead of NRZ modulation.
• FEC increases data integrity and two bits are transferred per transfer due to PAM-4.
• It supports transfer rate of 64.0 GT/s which is about 126 GB/s in each direction in 16-lane configuration.
• It supports total bandwidth for x16 configuration link of ~252 GB/s. Due to FEC, net bandwidth is not exactly doubled than PCI 5.0 version.


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