08-30-2017, 02:38 AM
http://www.tomshardware.com/news/pcie-4....35325.html
Quote:PCI-SIG indicates that PCIe 4.0 will be a short-lived specification because the organization has fast-tracked PCIe 5.0 for final release in 2019.
PCIe 4.0 will bring us 64GBps of throughput, while PCIe 5.0 will double that to 128GBps. Both revisions still leverage the standard 128b/130b encoding scheme that debuted with PCIe 3.0. PCI-SIG representatives said they are satisfied with the 20% reduction in overhead facilitated by the 128b/130b encoding, and further encoding refinements to reduce the current 1.5% overhead are subject to a diminishing point of returns.
Although we have yet to see PCIe 4.0 on the market, the fast-tracked PCIe 5.0 is already on revision 0.3, and the group predicts 0.5 will be available by the 4Q17.
The PCI-SIG defines the specification, but it has no control over when the end devices make it to market. Intel and AMD are the key enablers for the broad desktop market; we certainly won't see PCIe 4.0 GPUs and SSDs without a slot to plug them into. AMD has slated PCIe 4.0 for 2020. We imagine Intel is also chomping at the bit to deploy PCIe 4.0 3D XPoint and NVMe SSDs, but the company remains silent on its timeline.