PCI Express 6.0 With 256GB/s Coming in 2022 Because Screw Bandwidth Constraints

Today, the PCI-SIG announced that it’s already begun work on PCI-Express 6.0. If you’ve followed recent news about PCIe 4.0 and 5.0, this may seem like absolute overkill. PCIe 4.0 isn’t quite in-market yet, PCIe 5.0 won’t arrive until 2020 at the earliest, and now the PCI-SIG wants to finish PCIe 6.0 by 2021. Given the typical 12-month time frame for adoption, that would put PCIe 6.0 in-market by 2022.

Two things have happened to change the market since then. First, solid state drives have moved to PCI Express as a storage medium, which means improvements in storage performance became chained, at least in part, to improvements in the underlying standard. Clearly, nobody who has chafed under the restrictions of a PCIe 3.0 x4 configuration is going to have reason to chafe much longer. If PCIe 6.0 hits shelves in 2022, an x1 connection would offer the same bandwidth as a top-end x8 PCI-Express SSD today. The handful of drives that even offer this kind of interface today are enterprise products.

Ramping PCIe 6.0 bandwidth all the way to 256GB/s of bidirectional bandwidth would put an x16 connection on par with a lower-midrange GPU of today. It’s significantly more bandwidth than what we’d expect even DDR5 to provide in 2022 in a dual-channel configuration. I wouldn’t overstress the comparison — latency is going to be vastly different between the two solutions — but this is part of why companies like Intel are pushing towards the idea of non-volatile storage taking over some of the roles that have principally been held by DRAM.

While latency-sensitive workloads will always respond well to high-speed caches and fast interfaces, there’s a proven window of opportunity for high-bandwidth, high-latency products as well. GPUs are often cited as an example of products that are not particularly latency sensitive. PCI-Express 6.0 is also likely to be useful in self-driving systems, the industrial IoT, and any system that juggles multiple sensors to combine input from multiple peripherals into a cohesive whole. Increasing per-pin bandwidth can give a manufacturer the flexibility to perform the same work with a smaller amount of die size or wiring dedicated to the bus itself.

If the PCI-SIG pulls this off, it’ll deliver an 8x effective bandwidth increase in just four years. Considering it’s taken 15 years to deliver that kind of gain to date, the leap would be considerable. We wouldn’t expect consumer GPUs to necessarily be top beneficiaries, but storage arrays and non-volatile memory could be poised for major gains, along with AI accelerators and FPGAs in bandwidth-limited deployments. If PCIe 6.0 is actually ready by 2022, we may see fewer companies adopt 5.0 or 4.0 — or hell, they may just drop one new product a year to pick up the easy increase in performance. Either way, if PCI-SIG hits this delivery cadence, storage controllers are going to be the limiting factor in storage perf once again.

PCIe 5.0 Arriving in 2019 With 4x More Bandwidth Than PCIe 3.0The PCIe 5.0 Specification is Now Available, Before PCIe 4.0 Has Even ShippedHow Makimoto’s Wave Explains the Tsunami of Specialized AI Processors Headed for Market

Continue reading

Oppo Shows Off Concept Phone With Stretchable OLED Screen

Oppo has revealed a concept phone with a "continuously variable OLED display" that changes size in your hand to move between tablet and phone-like form factors.

No Flying Cars Yet, But How About a $300 Toaster With a Touch Screen?

As 2020 draws to a close, there's still no word on flying cars, but don't worry: We found something even better. For a certain definition of the word "better."

Intel’s Iris Xe Max Discrete GPU Is Slower Than the Integrated Version

Intel's Iris Xe Max has debuted, but the discrete GPUs performance is a bit odd, as new benchmarks show.

OpenAI’s ‘DALL-E’ Generates Images From Text Descriptions

All you need to do is give DALL-E some instructions, and it can draw an image for you. Sometimes the renderings are little better than fingerpainting, but other times they're startlingly accurate portrayals.