PCI-SIG Announces PCI Express 7.0 Specification to Reach 128 GT/s
PCI-SIG today announced that the PCI Express (PCIe) 7.0 specification will double the data rate to 128 GT/s [gigatransfers per second] and is targeted for release to members in 2025.
PCI-SIG technical workgroups will be developing the PCIe 7.0 specification with the following feature goals:
- Delivering 128 GT/s raw bit rate and up to 512 GB/s bi-directionally via x16 configuration
- Utilizing PAM4 (Pulse Amplitude Modulation with 4 levels) signaling
- Focusing on the channel parameters and reach
- Continuing to deliver the low-latency and high-reliability targets
- Improving power efficiency
- Maintaining backwards compatibility with all previous generations of PCIe technology
Also at Phoronix and Tom's Hardware.
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PCI Express 7.0 Finalized: 128 GT/s in 2025
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(Score: 0, Troll) by Anonymous Coward on Thursday June 23 2022, @04:45AM (3 children)
Ok... are there any consumer applications for this?
(Score: 1, Informative) by Anonymous Coward on Thursday June 23 2022, @04:55AM
Possibly not. GPUs are getting to where they don't need the bandwidth that's already available, and it seems like SSDs are nearing that point as well.
It might be that these high speed interconnects end up only being useful in data centers. But, if the bandwidth is available, maybe someone will find a use for it that no one has thought of yet.
(Score: 2) by takyon on Thursday June 23 2022, @03:45PM (1 child)
https://www.pcworld.com/article/704893/the-first-pcie-gen-5-0-ssds-are-almost-ready-for-consumers.html [pcworld.com]
https://arstechnica.com/gadgets/2022/02/pcie-5-0-ssds-promising-up-to-14gb-s-of-bandwidth-will-be-ready-in-2024/ [arstechnica.com]
PCIe 5.0 support will spread fast in the next year on the latest Intel and AMD (AM5) motherboards. SSDs will be the first component to make use of it, and won't be too far from maxing out PCIe 5.0 x4 (15.754 GB/s).
It could take a long time for PCIe 7.0 to come to consumers, but for example PCIe 7.0 x1 should allow for up to 121 Gbps for an Ethernet NIC with 1x 100 Gbps and some other ports.
SSDs are going to start to have cooling problems, and motherboards with PCIe 6.0 and above could need expensive design changes. PCIe 5.0 seems to be well handled on AMD's side by using dual chipsets so signals don't have to travel as far.
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @08:16PM
> x1 should allow for up to 121 Gbps
I wonder if the processors can keep up (yeah, DMA is a thing, but there is still a lot that has to go through the processor).
I guess the low power ARM stuff can forever stick with pcie gen 3 and gen 2.
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @07:59AM (5 children)
What's the very-non-SI "T" quantity? We're not Magnetic Flux Density here obviously, and googling only gives "GT" as a trademark.
(Score: 1, Interesting) by Anonymous Coward on Thursday June 23 2022, @09:09AM (3 children)
It's gigaTransfers/s referring to the raw bit rate as in without any encoding schemes. It's been used since the first PCIe version.
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @09:45AM (2 children)
can you please confirm: "128GT/s and compression could lead to >"?
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @09:47AM (1 child)
anyway. "128GT/s and compression ould lead to <<up to 512GB/s>>".
(Score: 3, Informative) by Anonymous Coward on Thursday June 23 2022, @10:37AM
No compression necessary. 128Gt/s * 2bits/t (PAM4) * 16 lanes = 4096Gb/s / 8bits/byte = 512GB/s
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @02:14PM
When saw GT I thought to myself "GigaTerabytes??", which although stupid would be more meaningful than Gigatransfers because it's measureable and comparable since the unit of transfer is know.
GT/s is meaningless by itself. Gigatransfers per second of what? 1 bit? 1 byte? 1024 btyes?
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @01:44PM (2 children)
This is a new term for us, albiet may have been in use before.
However, even the Wiki reference link sites no confirmed sources for the metric.
What happened to Hz, you know, the cycles per second SI unit?
Is that not a lot easier than the introduction of yet another unit of measure?
What am I missing here?
(Score: 2) by takyon on Thursday June 23 2022, @02:40PM
It has been in use "forever", you just didn't notice it.
https://en.wikipedia.org/wiki/PCI_Express [wikipedia.org]
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Thursday June 23 2022, @02:52PM
You're missing 20 years of computing history, because this has been in use since before the 1st PCIe 1.0 chips hit the market in early 2000s.
(Score: 2) by acid andy on Thursday June 23 2022, @11:42PM
That's the best bit.
If a cat has kittens, does a rat have rittens, a bat bittens and a mat mittens?