PCI-Sig Releases 256GBps PCIe 6.0 X16 Spec
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PCI SIG PCIe Releases And Growth PCI X To PCIe 6.0
PCI SIG PCIe Releases And Growth PCI X To PCIe 6.0

Today we have the next generation of PCIe, PCIe Gen6 or PCIe 6.0. This new generation will be able to handle 64GT/s which means 256GB/s on a PCIe Gen6 x16 link, double that of PCIe Gen5, or quadruple what today’s PCIe Gen4 servers can achieve.

PCI-SIG Releases 256GBps PCIe 6.0 x16 Spec

One of the big drivers for PCIe 6.0 the PCI-SIG says is SSDs. This is actually a really interesting chart. Cloud is expected to grow, as will client SSDs and that is likely the point of the chart. The bigger insight is that enterprise NVMe SSDs are a very small portion of the current and projected market. While cloud providers have largely swapped to NVMe, many enterprise vendors are still on SAS SSDs.

PCI SIG Forward Insights SSD Forecast August 2021
PCI SIG Forward Insights SSD Forecast August 2021

The big story here though is really the cadence. PCIe Gen3 to Gen4 was a very long cadence. After Gen4, the speed at which we are getting new standards is increasing rapidly.

PCI SIG PCIe Releases And Growth PCI X To PCIe 6.0
PCI SIG PCIe Releases And Growth PCI X To PCIe 6.0

2022 will be the year where we see broad platform support for PCIe Gen5 so the next-generation Gen6 will not be in 2022. Still, having the standard with new Flits (fixed size flow control units) for lightweight FEC, PAM4 signaling, and more is a big deal. This means that the ecosystem can start building and validating designs to the new standard.

Final Words

PCIe Gen6 is important beyond just having a faster pipeline for a SSD. Recall that Compute Express Link or CXL sits atop PCIe Gen5. While we may not necessarily see the need for 800GbE or dual 400GbE adapters right away, the new PCIe standard also means that CXL can potentially build its specification atop the faster Gen6 architecture and get more speed for next-generation servers. The implications of a new Gen6 architecture extend across the domains of storage, networking/ interconnects, accelerators, CPUs, and even to the possibilities for next-generation cache-coherent fabrics.

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Thank goodness we are in a period of rapid innovation instead of the slow pace in the PCIe Gen3 era.

If you want to learn more, check out the specification page here.

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2 Comments

  1. How long does it usually take to get consumer products of new PCIe specs? Fast PCIe Gen 4 is only just getting affordable. Like $350 for 2 TB NVMe ssds.

    Also, I remember playing around with PCI implementation on FPGAs over a decade ago and timing was already not easy. What goes into creating a PCIe Gen4/5 device these days? How can you actually achieve that when you're designing it? Are people just buying the chipsets from a handful of producers because it's unachievable for normal humans?

    EDIT: What's inside the spec differences between say gen 3 and 6 that allows for so many more lanes to be available?

  2. what use case does this level of bandwidth open up, and I am not able to understand why the article thinks SSDs are one of them. PCIe already provides more than enough bandwidth for the fastest SSDs, am I missing some forward-looking advancement?