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Thread: Asrock X99 Extreme4 - SLI Question




  1. #1
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    Default Asrock X99 Extreme4 - SLI Question

    I am adding another card to my system and wondered what 2 slots I should use for the 2 cards? They are both Gigabyte GTX 970's. The board is an Asrock X99 Extreme 4.

    Also, are there any tips or tricks for running SLI? I've never done it.

    TIA - Mudbone

    http://www.asrock.com/mb/Intel/X99%20Extreme4/

    Last edited by Mudbone; 11-23-2014 at 03:49 AM.

  2. #2
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    parsec is offline Senior Member
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    Default Re: Asrock X99 Extreme4 - SLI Question

    You should, or probably must, use PCIe lanes 1 and 3 for your two video cards.

    Both PCIe lanes 1 and 3 operate at PCIe 3.0 speed, while PCIe lane 2 runs at PCIe 2.0 speed.

    The PCIe 3.0 support is provided by your CPU, while the PCIe 2.0 support is provided by the X99 chipset. Trying to do SLI with a card on two different PCIe connections will probably be a problem, so don't do it.

    Your CPU (unknown) will determine if PCIe lane 1 and 3 both run in x16 mode. If you have an i7-5820K, that has 28 PCIe 3.0 lanes, two cards is SLI will run at x16 and x8. If you have either of the two other Haswell-E processors, both cards will run at x16.

    Check your board's manual about setting up SLI, it should have a good description about that.

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    Default Re: Asrock X99 Extreme4 - SLI Question

    Thanks for the reply and information. I have a i7 5820K.
    Last edited by Mudbone; 11-25-2014 at 11:30 PM.

  4. #4
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    Default Re: Asrock X99 Extreme4 - SLI Question

    Well, I got lucky. Second card in and SLI is working nicely, with Far Cry 4 nearly doubled in frame rate. I had to set the SLI bits to Batman: Arkham Origins, per others recommendations, to stop the shadowing, artifacts and getting darker over time issues.

    I say lucky because I didn't know there were as many details as there are to going SLI and it turns out I got a decent motherboard, CPU and power supply for doing 2 cards at least, and the SLI bridge came with the motherboard, as well as the power cable I needed.

    2 Gigabyte GTX 970's installed
    Asrock X99 Extreme4 MB
    i7 5820K


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