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Thread: Oh men problems! [Ibex-Peak and Lynnfield - 32 PCI-Express lanes but just 16 active!]

  1. #1

    Arrow Oh men problems! [Ibex-Peak and Lynnfield - 32 PCI-Express lanes but just 16 active!]

    Hello Men!

    These days I'm researching on Ibex-Peak (specially P55) + Lynnfield platform and I got some of big problems!!

    As we know :
    (i). Each Lynnfield CPU has 16 PCI-Express lanes
    (ii). Each Ibex-Peak (P55 PCH) has 16 PCI-Express lanes
    (iii). Lynnfield is connected to Ibex-Peak (P55 PCH) with DMI [thats slow for GPUs]

    Now questions :
    1. When a P55 motherboard has 2 PCI-Express slots they should be provided by Lynnfield CPU not P55 PCH because DMI is slow, right?

    2. if "1" is true then why Ibex-Peak (P55 PCH) has 16 PCI-Express lanes?! actually they are dead with DMI!!

    3. I found that some of P55 solutions (like Jetway HI05) has three PCI-Express slots, anyone knows about the configuration?!



    Thanks in advance ...
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  2. #2
    I am Xtreme zanzabar's Avatar
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    i think that that jetway has a special slot for some proprietary card.

    for the p55 it looks like the best option is to get something with 8x8 or 8x8x4 (with the 4 from the p55 and the 8x8 from the cpu), if u get a slot controller like the nf200,plx or hydra u are just adding in latency and with the plx and hydra some direct gpu to gpu bandwidth and that would be worthless IMO since the cards of now with 1 gpu per slot work great on 8x with almost no hit.

    u have to remember that the p55 is a midrage platform intel wants to force people who want 3/4 gpus to the i7
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  3. #3
    I am Xtreme
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    Migis picture from expreview should make thing clear, although it shows clarkdeal and not Lynnfield:

    Lynnfield has 16 lanes that are available for the GFx and can be 16x or split to 8x8. The P55 has 8 lanes available, but most of them will be occupied by 3rd party controllers (sata3.0, usb3.0, GbE, etc.) so i guess you will have approx 4 left to be assigend.

    Boards with 3 16x slots usually will only have it phsically and the 3rd slot will be 4x electrical as zanzabar already explained.

  4. #4
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    Quote Originally Posted by Hornet331 View Post
    Migis picture from expreview should make thing clear, although it shows clarkdeal and not Lynnfield:

    Lynnfield has 16 lanes that are available for the GFx and can be 16x or split to 8x8. The P55 has 8 lanes available, but most of them will be occupied by 3rd party controllers (sata3.0, usb3.0, GbE, etc.) so i guess you will have approx 4 left to be assigend.

    Boards with 3 16x slots usually will only have it phsically and the 3rd slot will be 4x electrical as zanzabar already explained.
    http://en.expreview.com/2009/08/19/t...-i5-750.html/4

  5. #5
    zanzabar - Hornet331 - Migi06 --> thanks! I got my answer
    www.HotOverclock.com Founder & Editor in Chief
    ---------------------
    Upgrading to X58 ...

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    PSU Zalman ZM1000-HP 1000 Watt Six 12v Rail and Dual Seperate Board
    A4Tech X7 Gaming Mouse X-750BF Dual Laser Engin w/2500DPI
    More about my Memory : it can do 950MHz 4-4-4-8 2.0v Stable and 1100MHz 5-7-7-12 2.2v Stable and 1200MHz 6-8-8-21 2.3v not Stable!

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