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Old 19-06-19, 08:41 AM
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PCI-SIG announces PCIe 6.0, because who doesn't want more bandwidth?

Expect a PCIe 5.0 replacement in 2021.



Read more about PCI-SIG's upcoming PCIe 6.0 standard.

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Old 19-06-19, 09:10 AM
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I always wonder how they come up with their definitions. Is there a team of researchers around there that tells them what should be doable at that time or how does the definition work? It feels like somebody just yells "FASTER!" every now and then and then his peasants say "okay" and just *insert multiplier here* the rates

Can someone please enlighten me
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Old 19-06-19, 01:28 PM
tgrech tgrech is offline
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PCI-SIG is a non-profit consortium mostly made up of engineers from a variety of other companies, they work out the spec over a long series of meetings, generally different companies end up having differing levels of influence & investment on each spec, but hardware vendors need to be imminently involved as at least one of them needs to create test silicon to validate the 0.7 spec. Definitely the most time consuming part with PCIe4 was just working out & agreeing on what was possible, which mostly comes from analysis & validation of new techniques for safely increasing signal rate or encoding efficiency. While a combination of two techniques was eventually found that could hit the goal of 16GT/s, there was disagreement on whether the initial plans for PCIe4 would actually be able to achieve those speeds practically in most devices & workloads and so quite a few further refinements had to be made to the 0.7 spec. These are the steps taken in development of a new PCIe spec:

Quote:
Draft 0.3 (Concept): this release may have few details, but outlines the general approach and goals. For PCIe 4.0 this included the 16 GT/s signaling rate, re-use of the 128/130 encoding scheme developed for PCI 3.0 8 GT/s mode, maintaining full backwards compatibility, etc. and was released in February 2014.
Draft 0.5 (First draft): this release has a complete set of architectural requirements and must fully address the goals set out in the 0.3 draft. The PCIe 4.0 Draft 0.5 specification was released in February 2015.
Draft 0.7 (Complete draft): this release must have a complete set of functional requirements and methods defined, and no new functionality may be added to the specification after this release. Before the release of this draft, electrical specifications must have been validated via test silicon. For PCIe 4.0, two independent implementations were provided to PCI-SIG workgroup members, one from Synopsys, and the other from Mellanox. The PCIe 4.0 Draft 0.7 was released November 15, 2016.
Draft 0.9 (Final draft): this release allows PCI-SIG member companies to perform an internal review for intellectual property, and no functional changes are permitted after this draft.
1.0 (Final release): this is the final and definitive specification, and any changes or enhancements will be through Errata documentation and Engineering Change Notices (ECNs) respectively.
Full article from a Synposys engineer who was heavily involved with PCIe4's practical development: https://www.chipestimate.com/PCI-Exp...cle/2017/02/21
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Old 23-06-19, 06:03 PM
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The best part about this is they say compared to 5.0 specification the length should remain almost exactly the same. So you're doubling the speed without making the length shorter. That's impressive. That should also really help lower cost for consumers and Enterprise boards.
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Old 24-06-19, 09:09 AM
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Showing more bandwidth into lanes proved expensive for PCI-E 4. How viable will it be for manufacturers to maintain signal integrity for faster standards over long lanes is to bee seen. It can be done. But at what price?

ASUS showcased Prime Utopia concept. Going away from ATX standard. Maybe in the future will be more profitable, or necessary to change the standard to accommodate uber fast lanes.
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