We were told a few months back that PCI Express 4.0 standards would be ratified this year and our friends over at PCI-SIG was easily able to meet that deadline as they have finalized and published the PCIe 4.0 Specification Version 1.0! The new PCIe 4.0 standard will increase the interconnect bandwidth from 8 GT/s to 16T/s while remaining backward compatible with PCIe 3.0 devices. Additional functional enhancements include:
PCIe 4.0 is a significant milestone, but the group is already actively working on PCI Express 5.0! Right now they are currently working on version 0.3 of the forthcoming PCIe 5.0 specification, targeted for Q2 2019. Right now PCIe 5.0 is expected to increase speeds to 32GT/s, yielding 128 GB/s of bandwidth in full duplex networking situations!