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Thread: EP45-UD3P PCI-e slots confusion




  1. #1
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    Default EP45-UD3P PCI-e slots confusion

    I currently have the board mentioned in the title of the thread and just realized a weird thing by chance. I have Radeon 5850 and GPU-Z says PCI-E 2.0 x16 @ x8 2.0. Wtf? I know there is some sort of PCI-e lanes limitation on P45/55 chipset, but thought I simply have to use the upper x16 slot for full performance. Apaprently it is not so...
    The slots are filled like this:
    PCIEX1_1 - empty
    PCIEX1_2 - network card
    PCIEX16_1 - VGA
    PCIEX1_3 - empty, covered by VGA
    PCIEX8_1 - sound card

    Help!

  2. #2
    SolidBladez's Avatar
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    Default Re: EP45-UD3P PCI-e slots confusion

    When you insert a card into the second PCIe x16 slot, the first PCIe x16 lane drops down to 8x. Is your sound card PCIe 1x? If so, try it in one of the available slots.

    Even so, you won't notice any difference at all if you keep your configuration the way it is. Your video card doesn't have enough bandwidth to bottleneck the lane. If it were something like the 5970 or other dual-GPU card, then I would be somewhat concerned.
    Last edited by SolidBladez; 06-19-2010 at 01:28 PM.

  3. #3
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    Default Re: EP45-UD3P PCI-e slots confusion

    Unfortunately I can't use other slots. One is blocked by the VGA and the other (the first one) by chipset heatsink. Bah.
    And unfortunately there is a difference. I play LoTRO atm, and while my FPS is still above 40, sometimes the movement of the character is laggy or how to describe it - like if the screen froze for a milisecond every step or two.

  4. #4
    profJim's Avatar
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    Default Re: EP45-UD3P PCI-e slots confusion

    In my rev 1.0 user manual, note #3 says on page 12 in the Product Specifications section "When two graphics cards are installed, the PCIEX16_1 slot will operate at up to 8X mode."
    Maybe you're not even running at full 8X mode.
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  5. #5
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    Default Re: EP45-UD3P PCI-e slots confusion

    GPU-Z says x8. The big WTF for me is that a game would need so much bandwidth.

  6. #6
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: EP45-UD3P PCI-e slots confusion

    Well it may just be due to the card using that much bandwidth, no matter if the game needs it or not?

    Your best bet is to get a different sound card or use onboard sound for now until you decide what to do.

  7. #7
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    Default Re: EP45-UD3P PCI-e slots confusion

    Confirmed, removed the card and now the gaming is as smooth as it could. Apparently it doesn't matter what I insert in the slot.
    Time to upgrade...

  8. #8
    Lsdmeasap's Avatar
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    Default Re: EP45-UD3P PCI-e slots confusion

    Ahh well at least you found the culprit!

    Now you need to decide on a different sound card or just use the onboard which actually sounds pretty good to me.

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