Performance of Crossfire 7970's in 8x/8x

I ordered an additional 7970 yesterday because the price was right, but I'm aware that I will be running my cards in 8x|8x instead of 16x|16x my question is what kind of hit am I going to take on performance?

I'm just curious, some people tell me the difference will be un-noticeable.
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More about performance crossfire 7970
  1. Can I ask what motherboard you are using?

    even pcie 2 running at 8x should not be an issue at all.
  2. It will increase FPS in Games
  3. MaximumPC just did a comparison with x8/x8 vs x16/x16 with high end GPUs and if I recall correctly it's only about a 5% penalty so still a good upgrade.
  4. On PCIE-3 it will be small..... On PCIE-2 it is noticeable.

    make sure you d/l the 13.8 Beta driver.... it fixes some of the problems w/ CF .... tho issues remain
  5. spentshells said:
    Can I ask what motherboard you are using?

    even pcie 2 running at 8x should not be an issue at all.


    I'm using an Asrock Exreme4 z77 motherboard (The Toms hardware approved one)
  6. steamywildwood said:
    spentshells said:
    Can I ask what motherboard you are using?

    even pcie 2 running at 8x should not be an issue at all.


    I'm using an Asrock Exreme4 z77 motherboard (The Toms hardware approved one)


    No problem then
  7. That's really good news, even a 5% loss like some of you said wouldn't be so bad
  8. steamywildwood said:
    I ordered an additional 7970 yesterday because the price was right, but I'm aware that I will be running my cards in 8x|8x instead of 16x|16x my question is what kind of hit am I going to take on performance?

    I'm just curious, some people tell me the difference will be un-noticeable.


    my cards running 3.0 x16 & 2.0 x4. it works great in crossfire!
  9. Anonymous said:
    steamywildwood said:
    I ordered an additional 7970 yesterday because the price was right, but I'm aware that I will be running my cards in 8x|8x instead of 16x|16x my question is what kind of hit am I going to take on performance?

    I'm just curious, some people tell me the difference will be un-noticeable.


    my cards running 3.0 x16 & 2.0 x4. it works great in crossfire!


    Which cards?

    Is this a B75 motherboard?
  10. spentshells said:
    Anonymous said:
    steamywildwood said:
    I ordered an additional 7970 yesterday because the price was right, but I'm aware that I will be running my cards in 8x|8x instead of 16x|16x my question is what kind of hit am I going to take on performance?

    I'm just curious, some people tell me the difference will be un-noticeable.


    my cards running 3.0 x16 & 2.0 x4. it works great in crossfire!


    Which cards?

    Is this a B75 motherboard?


    asus hd7790 direct cu 2 OC 1GB
    No, Im using Asrock H77m.
    But your cards are better than my cards..lol
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