Performance drop when recording in crossfire

Discussion in 'MSI AfterBurner Application Development Forum' started by birgirpall, Feb 7, 2012.

  1. birgirpall

    birgirpall New Member

    Messages:
    3
    Likes Received:
    0
    GPU:
    2x Gigabyte Radeon HD6850
    I'm using the latest afterburner beta (12) and just switched from a single HD5870 to 2x HD6850s in crossfire. After a lot of messing around with drivers (had to downgrade to 11.10 with 11.9 CAP4 to get BF3 to run stable) it's smooth, unless I try to record, then I get an insane reduction in framerates, MUCH lower fps than when I wasn't running in crossfire. I might be playing with 80-120fps, but when I record, it drops to 40-50. Compared to the single 5870, I would be getting 70-100fps normally and very similar when recording, I barely noticed a drop at all.

    Does the recording feature not support crossfire or something?

    Incidentally, when I disable crossfire and just run one 6850, I get the same FPS while recording as I do in crossfire.
     
    Last edited: Feb 8, 2012
  2. Ferrat

    Ferrat New Member

    Messages:
    5
    Likes Received:
    0
    GPU:
    Gainward GTX 570
    What resolution when running CF and what resolution when running singel?
    If recording fullscreen 1080p then @60FPS there will be a ~50MB/s write to your harddrive which is a lot or if you compress it that might also slow things down, higher resolution = more data = lower FPS.
    Try recording 1/2 frame and avoid recording to the same HDD as other things use at the same time, lowering your resolution can also help.
     
    Last edited: Feb 8, 2012
  3. Unwinder

    Unwinder Moderator Staff Member

    Messages:
    15,664
    Likes Received:
    3,123
    Its vice versa, it is crossfire is unable (and will always be unable) to handle recording effectively. Welcome to the world of ncie world multi-GPU limitations, ULPS and so on :)

    http://forums.guru3d.com/showthread.php?p=4179743
     
  4. birgirpall

    birgirpall New Member

    Messages:
    3
    Likes Received:
    0
    GPU:
    2x Gigabyte Radeon HD6850
    Thank you, that's the answer I was looking for but was unable to find with the search feature :)

    Time to return some cards.
     

Share This Page