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Why does Crossfire 7970 & 7950 return worse FPS in games

I have just tried out crossfire with a 7970 in slot 1 and a 7950 in slot 3, slot 2 has no space.

the benchmarks are superior than a single 7970 but in games ive yet to find a game where i see drastic FPS difference, in fact the FPS seems to be less.

am i doing something wrong?

the Motherboard is an Asrock extreme 4 970, i dont think i can plug the second gpu into slot 2 due to space
5 answers Last reply Best Answer
More about crossfire 7970 7950 return worse fps games
  1. Not all games support Crossfire.
    What games are you specifically attempting to run, where you're getting worse results?
  2. Belphegore said:
    Not all games support Crossfire.
    What games are you specifically attempting to run, where you're getting worse results?


    There is also the possibility that you're CPU limited in the games you're testing. The fastest AMD FX processor is still not very competitive.
  3. Belphegore said:
    Not all games support Crossfire.
    What games are you specifically attempting to run, where you're getting worse results?


    hi,

    I have tried watchdogs, the division, need for speed shift 2, battlefield harldine and others

    benchmarks like heaven are no issue there is definitely more grunt there, but i was expecting increase in games which im getting hardly anything.

    ive just come off watchdogs and single 7970 gives around 3fps more stood in same spot. i might just keep trying to see if i get improvements if not i will trade in the 7950
  4. Best answer
    I had cfx 7870's for a few years, had to get rid of it. the 7xxx series cards were before amd removed the crossfire bridge and developed XDMA. these setups are bandwidth limited via the bridge and often see stutter and lack of performance. It is common to see a lack of performance when the driver is not properly implemented for a game to support crossfire x.

    you have a weird setup. 7970 and 7950 will work, but amd dosent really recommend it and its kinda sketchy to make it all work together. I would try changing the slave and master around. aka set the 7950 as the main and then the 7970 as slave as Ive seen several dual graphics setups work better that way for some reason.

    Best solution? sell the 7950. I have a single 7970 right now, and it plays all of my games just fine.

    I'm going to wait for the Polaris 10 card to come out at the end of this month before I upgrade (expected identical to 390x performance with less than half the power draw.) and I was about to buy a 390x a few months ago before I read this.
  5. I know this is an old post, but you have to but the weaker card in the top slot, in this case being the 7950. And ensuring that both cards are clocked at the same rate.

    Not all games support crossfire, and only a handleful or so have really good support.
    I'm running my 7870 XT and 7950 together, clocked them at the same rate and it works alright, games that support it do very well. Crysis 3, Bf4, Bf3, Mad Max havent found any other games that I own to be any better yet.
    But yes in the games that dont support it, you wont get any increase in performance and can possible get a few less frames too.
    Another tip is to make sure your fan speeds on the cards are ramped up and have good airflow in the case as the top card will get really hot.
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