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  • jaisriramin - Tuesday, June 28, 2005 - link

    Hi everyone,
    i have just started working on PCI-Express
    and don't kow much about it. could anyone please clear some of my doubts?

    1> I want to find nunmber of lanes of any given PCI-Express. Is it the value in Link status register?

    2> How do i access this value? Will i need to write any driver for accessing the register? I am working on VC++ platform.

    regards
    sriram.
  • AlecRyben - Tuesday, August 24, 2004 - link

    If you put two X16 PCI-E slots on a motherboard, does that mean that you cannot have any other PCI-E slots? Is 32 lanes the maximum you can use?
    If that's the case, i see no point in having that. I would rather have two X8 slots and leave the remaining 16 lanes available for additional expansion (for 1X/2X/4X capable slots for example)
  • KristopherKubicki - Monday, August 23, 2004 - link

    cheburashka: You can use x10 for power but only x8 for moving data. I will change my wording a little.

    Kristopher
  • jagd - Friday, August 20, 2004 - link

    via had pllanning 4 pieces 4x pci ekspress slot ,probably they made 1 piece 16 pci-ekspress slotthanks for scalable pci ekspress artitecture
  • thebluesgnr - Thursday, August 19, 2004 - link

    The lack of native Gigabit in the new southbridge is a little disappointing, but I assume it won't be a problem if it's attached to the PCIe bus.
  • cheburashka - Thursday, August 19, 2004 - link

    I have been working with PCIe for over two years now and designed the Transaction Layer used in Intel's internal validation card. I am certain I know what I am talking about.

    From the 1.0a spec Link Status Register:
    Negotiated Link Width – This field indicates the negotiated width of the given PCI Express Link.
    Defined encodings are:
    000001b X1
    000010b X2
    000100b X4
    001000b X8
    001100b X12
    010000b X16
    100000b X32
    All other encodings are reserved.
  • KristopherKubicki - Wednesday, August 18, 2004 - link

    cheburashka, 10 lanes on a x16 interface?

    Kristopher
  • cheburashka - Tuesday, August 17, 2004 - link

    This guy is wrong, x10 is not allowed by the PCIe spec.
  • klah - Monday, August 16, 2004 - link

    I doubt that NV will launch SLI before NF4, forcing people to buy VIA boards to use it. I am sure they want to get SLI/NF4 launched before xmas.
  • danidentity - Sunday, August 15, 2004 - link

    >>Now where is NF4 and Pci-e???

    Heh, no kidding. :)
  • Anemone - Sunday, August 15, 2004 - link

    Sounds like maybe end of August or September. They are talking about it now, and there isn't much left to Q3.

    Now where is NF4 and Pci-e???
  • danidentity - Sunday, August 15, 2004 - link

    So who knows when we'll see mobos with the K8T890 PRO?
  • johnsonx - Sunday, August 15, 2004 - link

    #2 & #4,

    I think you're both saying the same thing. Two x16 physical slots that have x8 signalling, or possibly 1 x16 and 1 x8 (but then you get no additional x4 slot(s) from the northbridge, which are surely faster than the 2 PCIe lanes coming off the Southbridge).

    #2 is also right; I don't have the numbers in my head, but I'm pretty sure that an x8 PCIe connection STILL has more bandwidth than 8x AGP, and no current card even uses all of that bandwidth.
  • epicstruggle - Sunday, August 15, 2004 - link

    goku21 #2,

    where did you see dual x16 slots? This article/blurb mentioned nothing of dual x16. What will more than likely happen is that you will be able to use 2 16xpcie vid cards, by plugging/slotting them in the 2 available 16x slots. BUT the 2 slots will not both be 16x, at most youll get 1 x16 and the other 8x or lower, or some combination of 8x+ slots.

    God i hope i dint make it more confusing.

    epic
  • Stefpet - Saturday, August 14, 2004 - link

    Since the K8T890 was first expected in Q2 it is great to see it finally coming so I - at last - may have my Athlon64 AND PCI-Express card...
  • goku21 - Saturday, August 14, 2004 - link

    It's nice to see someone producing the dual x16 slots.

    However, though I'm not totally sure of this, but aren't the PCIe graphics card that are out now barely just scratching the surface of the available bandwith that x16 has to offer? If that's the case, then for the time being a cheap x8 with a x16 interface wouldn't do any harm at all, but then again I could be wrong myself.
  • danidentity - Friday, August 13, 2004 - link

    I'm assuming "MP" in those images means Mass Production? If so, we're going to see mobos with the K8T890 PRO before the end of September?

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