Supermicro X11(S|D)Px bifurcation

Discussion in 'Processors and Motherboards' started by Rand__, Nov 20, 2018.

  1. Rand__

    Rand__ Well-Known Member

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    So I wanted to run a bifurcated card on my shiny new X11DPI-T and was... befuddled to say the least...

    These are the options according to the manual (for each CPU):

    CPU1 Configuration/CPU2 Configuration
    IOU0 (IIO PCIe Br1)
    This item configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
    The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto

    IOU1 (IIO PCIe Br2)
    This item configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
    The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto

    IOU2 (IIO PCIe Br3)
    This item configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
    The options are x4x4x4x4, x4x4x8, x8x4x4, x8x8, x16, and Auto

    MCP0 (IIO PCIe Br4)
    This item configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
    The options are x16 and Auto

    MCP1 (IIO PCIe Br5)
    This item configures the PCI-E Bifuraction setting for a PCI-E port specified by the user.
    The options are x16 and Auto

    So after fiddling for a bit I mailed SM support and they sent me back a nifty little manual how to enable bifurcation. Turns out I was not the first (and will not be the last); so I thought I share it.

    Basically you have to look up the CPU to Slot diagram in your boards manual, identify the n-th port per CPU and can then assign that specific port the desired bifurcation level. Things are made more complicated since all PCI-e lanes are listed here and only some are actual slots and only some are bifurcation capable to a certain degree (mostly because they are not bifurcated yet).
     

    Attached Files:

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  2. bood

    bood New Member

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    Did this work for you?

    I have an X9DRi-F that exposes the same BIOS options, tried toggling them all, matched the block diagram to the slot, nada. It can only see 1 SSD. I don't care about booting from them, I know that would require adding an NVMe module to the UEFI (read: BIOS modding).
     
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  3. Rand__

    Rand__ Well-Known Member

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    Well it did work on the X11 board, not sure how it works on a X9.
    But I think there have been discussions re X9 bifurcation in other threads here...
     
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