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ATI Crossfire, will CPU bottleneck my GPU

Hello everyone,
I'm new to whole upgrading components of my PC so I need your professional opinion/help.
So I found a new GPU (HD 6770) for 50$ used, and my question is; can I Crossfire the HD 6770 DDR3 with my current GPU Sapphire HD 5670 DDR5?
I'm playing Battlefield 3 so if anyone knows, will I get much better fps with those two cards compared to a single hd 6770?
My processor is Intel Core 2 Duo E8400 @ 3,0GHz OC'd to 3,6Ghz WILL IT BOTTLENECK MY NEW (hd6770) GPU?
Also I'm running Win7 32bit, 4GB of DDR2 RAM, power suppy 800Wats.
*I know my PC is low end, in a few months I'm getting a new mobo and basically building a new PC so I'm currently stuck with this configuration.
Thanks!!!!
7 answers Last reply Best Answer
More about ati crossfire cpu bottleneck gpu
  1. No, you cannot crossfire two graphics cards that are not in the same series, and in most cases you dont want to crossfire GPUs unless they are the same card.

    The CPU is a moot point.
  2. Actually you can crossfire some cards of different series but that's like the 6770 and 5770 (the 6770 is just a rebadged 5770). You can also crossfire cards like 6850 and 6870 as long as they're the same first two numbers you're generally fine too.

    For a complete list look at this.
    http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg

    Unfortunately with the two cards you're looking to CF it can't be done. Although the 6770 is a nice upgrade from what you have.

    The one thing that was right was that your CPU won't make much of a difference vs a modern one with how low end the hardware is.
  3. andrewcarr said:
    Actually you can crossfire some cards of different series but that's like the 6770 and 5770 (the 6770 is just a rebadged 5770). You can also crossfire cards like 6850 and 6870 as long as they're the same first two numbers you're generally fine too.

    For a complete list look at this.
    http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg


    Unfortunately with the two cards you're looking to CF it can't be done. Although the 6770 is a nice upgrade from what you have.

    The one thing that was right was that your CPU won't make much of a difference vs a modern one with how low end the hardware is.


    Yeah I probably could have articulated what I meant by "series" better... 68XX series, 59XX series, etc.
  4. andrewcarr said:
    Actually you can crossfire some cards of different series but that's like the 6770 and 5770 (the 6770 is just a rebadged 5770). You can also crossfire cards like 6850 and 6870 as long as they're the same first two numbers you're generally fine too.

    For a complete list look at this.
    http://sites.amd.com/PublishingImages/Public/Graphic_Illustrations/WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg

    Unfortunately with the two cards you're looking to CF it can't be done. Although the 6770 is a nice upgrade from what you have.

    The one thing that was right was that your CPU won't make much of a difference vs a modern one with how low end the hardware is.


    So if I get, lets say HD6670 only then I'll be able to CF it with my HD5670? One more question, will those two CF'd cards be much better then a single HD6770? If so, how much better? Thanks for replying so fast, both of you!
  5. Best answer
    If I were you I'd just get the 6770 and take out the 5670, with low end CF there tends to be the most micro stutter issues.
  6. andrewcarr said:
    If I were you I'd just get the 6770 and take out the 5670, with low end CF there tends to be the most micro stutter issues.


    Okay, I'm just gonna go with hd6770 or try to find something better with 80$ budget and used ofcourse. Anyways thanks for the help, much appreciated!!
  7. You're welcome.
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