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PCI Express 4.0 Spec Has Been Finalized PCIe 5.0 to go 32GT/s

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Oct 26, 2017.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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    Silva likes this.
  2. Silva

    Silva Master Guru

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    As this is right at the corner, I'll hold a bit more for motherboards to come out with this.
    Also DDR4 prices are ludicrous.
    They sure are going fast this time, working on 5.0 already.
     
  3. Picolete

    Picolete Master Guru

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    There wasnt a real need for higer bandwidth before, like there is now with so many PCIe storage devices and the speed this are getting faster and faster
     
  4. kruno

    kruno Master Guru

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    You are unfortunately going to wait a little bit longer because there want be mobo's with PCIE 4.0 probably until late 2018 or early 2019.Intel is not planning anything new till Z390 (and that is late 2018), and for AMD X470 is planned in April next year(so board design is probably finished) and next socket probably 2019.And lets not forget that they need to implement PCIE in processors,so that also requires some time.
     

  5. dfsdfs1112

    dfsdfs1112 Active Member

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    When will a motherboard come with PCI-4.0?
    When will a graphics card come with PCI-4.0?
     
  6. BlueRay

    BlueRay Master Guru

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    For users with only 1 GPU this shouldn't make any difference at all unless we are talking about SLI and CrossFire. People are still using PCI-E 2.0 without issues. I don't think 3.0 will be saturated by 1 GPU any time soon.
     
  7. Emille

    Emille Master Guru

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    This could be the start of something big. Imagine a motherboard with only an entry level number of pci 4.0 lanes which could easily have 4 or even 6 pci 4.0 x2 m.2 ports which could power all pci 3.0 x4 m.2 drives at max bandwidth and still have 16x 4.0 lanes for headroom for years for graphics cards and any other extra stuff a motherboarf could want. Even a board with only 28 lanes could have that, it could even do sli with 4.0 x8/x8 while still power all those drives.
     
  8. schmidtbag

    schmidtbag Ancient Guru

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    Here's what I don't get:
    What exactly is going to take advantage of this, even in the server market? To my understanding, x1 slots still aren't going to be fast enough to handle fiber optic NICs; they're currently using x4 or x8 slots. Same goes for enterprise SSDs. We might as well just skip straight to 5.0.
    USB 3.2 seems to be the only practical reason to need the available bandwidth, but, I doubt we're going to see any USB 3.2 devices that will actually saturate the bandwidth by the time PCIe 5.0 comes out.

    Anyway, correct me if I'm wrong but will a PCIe 5.0 x1 slot be as fast as a 1.0 x16 slot?

    Does it matter? To my knowledge, there are no GPUs that will saturate 3.0 at x8 (except maybe an overclocked 1080Ti under specific workloads).
     
  9. Emille

    Emille Master Guru

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    I've read a bunch of articles suggesting a lot of board makers are going to skip to 5.0 already, but you know tech is, anything new is a new marketing gimmick, I'm sure if they can create an artificial demand they will implement 4.0
     
  10. Silva

    Silva Master Guru

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    I think more bandwidth per lane is awesome, considering that then you need less lanes for each device to have the same performance.
    Currently you have to spend a small fortune if you want all the lanes, so having faster lanes might help on motherboards+CPU combos lacking in numbers.
     
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  11. schmidtbag

    schmidtbag Ancient Guru

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    More bandwidth is awesome, when you can actually take advantage of it. But as stated before, hardly anyone (including enterprise market) will benefit with PCIe 4.0. The x1 slots still won't offer enough bandwidth to replace PCIe 3.0 x4 devices. Using a PCIe 3.0 (or older) x8 device on a 4.0 x4 slot isn't going to run at its maximum potential. I am not aware of any M.2 devices that will even saturate PCIe 2.0 at x4 (M.2 uses x4 lanes). Meanwhile, there are currently no devices that fully saturate PCIe 3.0 at x8.

    In other words, PCIe 4.0 at x1 still isn't good enough and there is no demand to upgrade M.2/x4 and x8 slots at 3.0 speeds.

    What I personally would like to see is x16 slots start to get phased out, and PCIe 4.0 could be (but probably won't be) the beginning of that. x16 slots were very useful from gens 1.0 to 2.1, but they're pretty much useless at this point. They just take up a lot of space.

    EDIT
    Just to clarify, I do feel there will very soon be a need to upgrade PCIe (particularly for slots slower than x16), but I think we ought to just skip to the specs laid out for 5.0.
     
    Last edited: Oct 26, 2017
  12. Caesar

    Caesar Master Guru

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    and that's where NVIDIA's VOLTA and PCI express 4.0 (standardized) .......and GDDR6 (Hynix) will stand on 2018 upto 2021

    PRETTY SURE that i have been patient with my upgrades....

    [​IMG]
     
  13. dfsdfs1112

    dfsdfs1112 Active Member

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    You have not yet seen the PCI-4.0 and have already made decisions
    1. PCI-4.0 - Can help to NVMe M.2 ( In their tests PCI-E 3.0 x8 = 5000MB ) so in pci-e 4.0 X4 will be a big improvement

    2. Your calculation for a graphics card that can not meet PCI-4.0 is incorrect
    Next generation will be 7NM -10NM Next generation will bring 40% improvement

    3. The next generation will bring HDMI 2.1 which will bring 3 times bandwidth and informs that it will also affect
     
  14. -Tj-

    -Tj- Ancient Guru

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    Some 8core cpu (icelake or tigerlake) with ddr5 mobo + pcie 4.0 in 2019 sounds good :D
     
  15. schmidtbag

    schmidtbag Ancient Guru

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    Tell me one M.2 NVME drive that is provably bottlenecked by PCIe 3.0 with x4 lanes. Are you even aware of a drive bottlenecked by x2 lanes, or x4 lanes on PCIe 2.0?

    I promise you, a 40% improvement still will not saturate PCIe 3.0 at x16; that was my point. Therefore, I am not incorrect. Also, just because performance improves, that doesn't mean bandwidth goes up proportionately. Case in point: DX12 or Vulkan improves performance while decreasing bandwidth.
    Anyway, it doesn't matter how much of an improvement PCIe 4.0 has if the next-gen GPUs don't use it. If they're still on 3.0, then they won't benefit from the additional bandwidth per lanes.

    What does that have anything to do with PCIe? I am willing to bet you even a PCIe 2.0 slot could use a next-gen GPU with HDMI 2.1. I'm not saying the GPU will run at its full potential (it probably won't) but HDMI 2.1 would still be functional.


    Anyway, you seem to be intentionally forgetting that it isn't next-gen PCIe that I don't like, I'm saying we ought to skip to PCIe 5.0, because that will actually be useful; 4.0 doesn't fix anything, it doesn't cater to anyone's needs, and it doesn't effectively obsolete 3.0.
     

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