PCI Express 4.0 Spec Has Been Finalized - PCIe 5.0 to go 32GT/s

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We have talked a couple of times about PCI Express Generation 4 before, the spec now is final. PCI-Express Gen 4.0 will offer 16 GT/s per PCI-Express lane which is double that of the 8 GT/s on the current PCI-Express Gen 3.0 specification.



If you multiply then 16 GT/s per lane bandwidth translates into 1.97 GB/s for x1 devices, 7.87 GB/s for x4, 15.75 GB/s for x8, and 31.5 GB/s for x16 devices.  Keep in mind, PCI Express has moved well beyond graphics cards. Currently, nearly every IO device routes data through PCIe to send signals back to the CPU and across the platform. It is expected to see rapid adoption of the new standard for storage and networking products (10 GBit/s links). NVMe SSDs using PCIe 3.0 x4 recently reached the usable limit of the interface, ergo future NAND storage devices could benefit greatly from this new standard.


PCIe VersionLine CodeTransfer Ratex1 Bandwidthx4x8x16
1.0 8b/10b 2.5 GT/s 250 MB/s 1 GB/s 2 GB/s 4 GB/s
2.0 8b/10b 5 GT/s 500 MB/s 2 GB/s 4 GB/s 8 GB/s
3.0 128b/130b 8 GT/s 984.6 MB/s 3.938 GB/s 7.877 GB/s 15.754 GB/s
4.0 128b/130b 16 GT/s 1.969 GB/s 7.877 GB/s 15.754 GB/s 31.508 GB/s

PCI-SIG has released the PCIe 4.0 Specification Version 1.0 for review and it is available for download on their website. The final published spec describes the PCI Express architecture, interconnect attributes, fabric management, and the programming interface required to design and build systems and peripherals that are compliant.

The delivery of the PCIe 4.0 specification to the industry is an important addition to our spec library as it delivers high-performance 16GT/s data rates with flexible lane width configurations while continuing to meet the industry’s requirements for low power. Additional functional enhancements include:

  • Extended tags and credits for service devices
  • Reduced system latency
  • Lane margining
  • Superior RAS capabilities
  • Scalability for added lanes and bandwidth
  • Improved I/O virtualization and platform integration

PCIe 5.0 Doubles it all up one more

PCIe 4.0 is a significant milestone, but we’re not resting. We’ve already released the Version 0.3 of the forthcoming PCIe 5.0 specification, targeted for Q2 2019, which will increase speeds to 32GT/s. For more information on PCI-SIG or PCIe technology

Thanks, SH SOTN for this news-spot.

PCI Express 4.0 Spec Has Been Finalized - PCIe 5.0 to go 32GT/s

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