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Thread: Crossfire wont run in x8/x8

  1. #1
    Join Date
    Mar 2013

    Default Crossfire wont run in x8/x8

    I have searched and searched and cant find a solution. The other day i just finished building my new pc asrock z77 extreme4 mobo i5 3570k at 4.5ghz 16gig gskill aces series and a few other things from my old pc. I am running 2 sapphire 6870s in crossfire i reused from old pc for now. But i am seeing a few issues with frames in games so i decided to check my gpus.

    The issue i am running into is that the first card is pci 2.0 x8 and the second card is running pci 2.0 x2. As far as i know and according to the owners Manuel its supposed to be running at x8 for each.

    I have checked both cards by swapping them trying 1 by 1 and checked the power supply. both pcie slots run at x16 with only 1 card in. i have reinstalled drivers and cleared them multiple times.

    I have also read that usb 3.0 and sata 3 can steal buss speed from pci slots? anyone know if that could be my issue. Thanks in advance everyone.

  2. #2
    havasuphto is offline Junior Member
    Join Date
    Jan 2013
    Lake Havasu City, AZ

    Default Re: Crossfire wont run in x8/x8

    Are you familiar with ULPS? This is a feature in crossfire on the newer systems that basically disables the second card, when it's not needed. that might have something to do with it...but, I've never seen the problem you're describing. And, I don't think it's even physically possible with the crossfire bridge to install the card in the wrong slot.

    Do you run 2 monitors? Games? Most games I play will only use both cards in crossfire, when using "full screen", or multiple monitors. Otherwise, the 2nd card is basically "sleeping". I actually like this feature-as it saves on electricity/heat.
    I'm running dual 7970 Ghz in crossfire, and using 13.3 beta drivers.
    When I open up something that monitors my cards-if I'm not running a game or a 2nd monitor, the bottom card is off-no reading-no power, no light on-nothing.

    you can google ULPS and there is a program that can disable it-you might try that.....
    MB: AsRock OC Formula Z77 LGA 1155
    CPU: Intel i7-3770K Ivy Bridge 3.5Ghz
    CPU Cooler: Corsair H100i
    RAM: 32GB G.Skill Ripsaw DDR3-1866Mhz
    GPU: 2X Sapphire Vapor-X Radeon HD7970 3GB 384-bit GDDR5 Ram, in Crossfire
    HD1: Intel SSD 520 Series Cherryville 240GB
    HD2: WD Black 1TB 64MB Cache Ram 7200

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