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Battlefield 3 slower with crossfire

I'm running two 7870's in my build with eyefinity, with battlefield 3 @ 5760x1080. With this, i get about 10 fps on average. But when i turn off crossfire, I get about 40 fps. I'm not running THAT slow of a card that microstuttering can be causing such a drastic effect of an average drop of 30 frames. anyone have any ideas on what this could be?

Build:
i7-3770k
gskill 8gb 1600mhz
rosewill lightning 800W
2x7870s
asrock z77 extreme 6
25 answers Last reply Best Answer
More about battlefield slower crossfire
  1. Are both the slots on x8/x8? or x16/x8?
  2. Do you have a CF bridge and are you running the newest driver, Catalyst 12.6a, and if so, do you know for sure that you uninstalled any and all previous drivers completely?

    Also, as suggested by fantastik250, check the PCIe slots that you're using. One of them might be a PCIe x16 slot physically, but is a PCIe 2.x x4 slot electrically. Your motherboard might also need a BIOS update.
  3. hmm, sound's like driver related problem try to reinstall the driver try older version too.
  4. Now now guys, we don't know if the problem is a driver issue or not yet. That's what trouble-shooting is for.

    @OP are these 7870s overclocked? If so, then you might need to drop the clocks a little on one or both of them. Multi-GPU setups tend to not overclock as well as the cards can individually.
  5. Quote:


    Alright, so the old RC drivers don't like BF3. However, we still don't know enough about the situation to know for sure that this is even the problem and if it is, then a simple driver update should solve it.
  6. lol, hey stick to helping, we all have suggested something for the time being. Let's see what OP says.
  7. Alright guys thats enough, no one wants to see this when they come looking for help for a legitimate issue, if you wish to take this further please do so in PMs.

    @op, have you installed the latest CAP profiles along with the drivers? what are your cards set at and what is your average fps in furmark with and without xfire?

    Edit: hah recon beat my to it by a hair.
  8. Quote:
    Well i will not even comment on the track record... what do you want me to say? sheep fly?

    Look at AMD now... not releasing drivers until they are suitable for release... say much?

    Nvidia are not perfect, but that is not at question.


    As a proven track record of yourself, you defend AMD to the end, i do that to a 480.. but not the rest of the lineup, think about that.

    Let's end this now, as this thread is now littered with our retarded argument.

    Carry on with this in PM's if you like, i will just block you however ;)


    AMD not releasing drivers monthly? Well, considering what AMD plans on doing is exactly the way that Nvidia does it... Well, if you don't like it, then you don't like Nvidia's driver release strategy either because they are one and the same.

    @OP Have you tested both cards individually? One of them might have a problem and might need an RMA if the possible fixes that others have mentioned here don't work.
  9. Sounds like a driver issue

    fortunately easy to check

    try each card one at a time in the x16 slot

    If they are both good then software is the next most likely issue and can be dealt with by removing all drivers and starting again
  10. IMO driver issue can be :

    from user:
    - not the correct version (usually not the latest one)
    - conflict, corrupt, etc (wrong procedure, broken files, etc)

    from maker:
    - issue identified but not 100% fixed and released anyway


    @recon
    you said crap drivers (usually rever to "from maker") but also said bf3 has no issues in cfx and sli so the cause is "from user" -> contradicting and -> blaz reacts to defend the from maker

    so which one you actually meant ?
  11. Something is definitely wrong.

    With a single 6970 I got about 40fps on average, and when I added a second, well...

    See for yourself...

    http://www.youtube.com/watch?v=8Xa5y6KUZO0&list=UUZXSZdGb3Su8RvR5QuRyeqw&index=4&feature=plcp

    60-80fps average - with fraps (max settings @ 1080p).

    You should be doing at least as well.
  12. Please put personal grudge aside.
  13. all done, go for RMA.
  14. blazorthon said:
    Now now guys, we don't know if the problem is a driver issue or not yet. That's what trouble-shooting is for.

    @OP are these 7870s overclocked? If so, then you might need to drop the clocks a little on one or both of them. Multi-GPU setups tend to not overclock as well as the cards can individually.



    Tried it at both stock and OC speeds, same issue
  15. xplaywithmikex said:
    Tried it at both stock and OC speeds, same issue


    What driver version are you using and have you tested each 7870 individually?
  16. mouse24 said:
    Alright guys thats enough, no one wants to see this when they come looking for help for a legitimate issue, if you wish to take this further please do so in PMs.

    @op, have you installed the latest CAP profiles along with the drivers? what are your cards set at and what is your average fps in furmark with and without xfire?

    Edit: hah recon beat my to it by a hair.


    I do have the latest CAP profiles, gonna run 3dmark vantage and ill see what fps i get on that with cf.
  17. blazorthon said:
    What driver version are you using and have you tested each 7870 individually?

    i am on catalyst 12.4, and i have tested them both. they work fine alone.
  18. Best answer
    xplaywithmikex said:
    i am on catalyst 12.4, and i have tested them both. they work fine alone.


    Try Catalyst 12.6a. It fixes several CF driver problems with Radeon 7000 cards that are present in older versions.
  19. err, i see 12.6 beta, but not 12.6a. the only 12.6a i see is in the CAP profiles
  20. Ahh, maybe I missed that version coming out. Give it a try.
  21. huh, that actually solved it. thanks for the help!
  22. Best answer selected by xplaywithmikex.
  23. xplaywithmikex said:
    huh, that actually solved it. thanks for the help!


    You're welcome.
  24. Quote:
    BF3 has no issues with CFX or SLi.


    Except in 3-way X-Fire..... Giru3D couldn't get it to run back when they tested it, not sure if it has been resolved with latest 12.6a
  25. Sigh... finally.

    This topic has been closed by Pyree
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