PCI-SIG Announces PCI Express 4.0 Specifications
In June, PCI-SIG announced that PCI Express 4.0 had been finalized and was undergoing review and testing. Well, now the company has released the final specifications for PCI Express 4.0.
“I’m pleased to share that PCI-SIG has released the PCIe 4.0 Specification Version 1.0 and it is now available for download on our website,” said PCI-SIG president Al Yanes. We had previously announced in June this year at our annual DevCon event that the Version 0.9 specification was feature complete and undergoing member IP review.”
The biggest improvement that 4.0 features over 3.0 are the improved speeds. Version 3.o offered 8 gigatransfers-per-second and 8 gigabytes-per-second of link bandwidth per lane. In 4.0, both of those numbers have been doubled to 16. In total, this means that 4,0 will offer 64 gigabytes-pers-second per 16-lane slot.
For the first three versions of PCI Express, PCI-SIG released upgrades every four years. However, they broke with that tradition with version 4.0. It has been seven years since the release of 3.0. The organization, which is composed of roughly 800 companies, says that the delay was due to a lack of need. They felt that 3.0 provided enough bandwidth until things such as PCIe NVMe storage and 10-gigabyte ethernet network speed became more commonplace.
It is likely that we won’t see widespread adoption of this technology for a few more years, but some companies are already getting on board.
” And we’ve seen unprecedented early adoption! Prior to publication, we’ve had numerous vendors confirmed with 16GT/s PHYs in silicon and IP vendors already offering 16GT/s controller. Given the interest, we held a pre-publication Compliance Workshop with preliminary FYI Testing Only for PCIe 4.0 architecture that attracted dozens of solutions. We’re continuing to conduct FYI testing in our workshops throughout the remainder of the year.”
Members of the PCI-SIG can download the 4.0 specifications for free on the organization’s website. Non-members may order a hard copy for $4,500.
Eric is an avid tech junkie, gamer, and comic fan. When he's not working on his PC, you'll find him at your local comic book shop.