# [OmniOS-discuss] PCI-e x8 only running x4

Richard Elling richard.elling at richardelling.com
Tue Jan 24 01:52:44 UTC 2017

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    > On Jan 23, 2017, at 5:17 PM, Michael Rasmussen <mir at miras.org> wrote:
    >
    > On Mon, 23 Jan 2017 19:27:51 -0500
    > Dale Ghent <daleg at omniti.com> wrote:
    >
    >>
    >> Check your BIOS settings for the slots, they might be limited there. I also note that this motherboard model has two physical x8 PCIe slots but one of them is wired for 4 lanes only. Is your card in that slot? Something not linking up like this is likely to be more of a hardware configuration issue.
    >>
    > Doesn't this proof an x8 slot? LnkCap: Port #0, Speed 2.5GT/s, Width x8
    > I was aware of that one of the x8 slot was actually a x4 slot so I am
    > quite certain I have picked the right one.
    >
    > It couldn't be as simple as since there is no disks connected to the
    > second channel so the 4 lanes for the second channel is not active?
    >
    >> Also keep in mind that the 1068E card is quite old and its driver support in OmniOS/illumos is still the closed-source mpt driver binary, so there is not much room here.
    >>
    > I am aware of that and an upgrade to a 2x08 is on the todo list.

    This card can’t saturate a modern x4, so you gain nothing going to x8.
     — richard

    >
    > --
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    > Michael Rasmussen
    >
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    > mir <at> datanom <dot> net
    > http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C
    > mir <at> miras <dot> org
    > http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917
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