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  1. #1
    Joined
    Apr 2010
    Posts
    30

    Two CrossFire Bridges - Which one to use on my video card?

    I just purchased two identical ATI Radeon HD 5770 on the cheap (relatively speaking, of course) and wanted to try out CrossFire for the first time.

    The graphics card has TWO CrossFire bridges, presumably to support linking three graphic cards.

    I like to know if there is a naming scheme to the two bridges. Which is bridge #1? Which is bridge #2? Even if it does not matter which one I use, I like to know if there is numeric assignment to these bridges (much like USB ports, like Port #1, Port #2, etc.)?

  2. #2
    Joined
    Mar 2003
    Location
    Central NJ
    Posts
    11,090

    Re: Two CrossFire Bridges - Which one to use on my video card?

    AFAIK they are interchangeable


    Trust me, I do science
    My Hardware, Past and Present

  3. #3
    Joined
    Apr 2010
    Posts
    30

    Re: Two CrossFire Bridges - Which one to use on my video card?

    Thanks, mod. Even though they are "interchangeable", do you know the convention of which is bridge #1 and which is bridge #2? Surely, like ports, these would be numbered?

  4. #4
    Joined
    Feb 2004
    Location
    Janesville, Wi
    Posts
    6,450

    Re: Two CrossFire Bridges - Which one to use on my video card?

    Quote Originally Posted by to1337ca View Post
    Thanks, mod. Even though they are "interchangeable", do you know the convention of which is bridge #1 and which is bridge #2? Surely, like ports, these would be numbered?
    Doesn't matter, they are electrically the same


  5. #5
    Joined
    Mar 2003
    Location
    Central NJ
    Posts
    11,090

    Re: Two CrossFire Bridges - Which one to use on my video card?

    mmettin is correct. To expand a bit: It really doesn't matter, the cards will automatically figure out which is which. The connectors may be numbered on some technical document somewhere, but they are physically identical, links are automatically negotiated by the cards and which one you use should be determined purely by your preference. Even in 3 or 4-way CF with multiple bridges the relationship between the cards is controlled by which PCI-E slot the cards occupy (card closest to CPU is the "master") rather than positioning of the bridges.

    I have preferred the port closest to the backplate in the past simply because the bridge isn't super attractive to look at and its usually less visible there from the window. Luckily this isn't an issue with AMD's new bridge-less CF tech


    Trust me, I do science
    My Hardware, Past and Present

  6. #6
    Joined
    Apr 2010
    Posts
    30

    Re: Two CrossFire Bridges - Which one to use on my video card?

    Thank you kindly. It is great to get this clarified from a knowledgeable mod like you.

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