content: The 5.0 spec is coming in 2019 is my understanding. It'll be a couple more years before you really start seeing a lot of products utilizing it. Once the spec is finalized, then products can be designed around it. PCIe 4.0 was just released, like literally today actually. I should have found this article and posted it. https://techreport.com/news/32064/pcie-4-0-specification-finally-out-with-16-gt-s-on-tap Probably see some 4.0 products start trickling out near the end of this year.