How doest MP determine primary video card

Discussion in 'Mac Pro' started by wa5655, Oct 1, 2011.

  1. wa5655 macrumors member

    Joined:
    Jun 12, 2010
    #1
    I have 2x5770 in my '09 MP running SL. one in slot 3 and one in slot 1. One would think MP will pick slot 1 (during start up) to be the primary, however, it picks slot 3. I re-arranged under "Display" and the monitor connects to slot 1 becomes primary (where the menu bar is), but that is only after booting has finished.

    It won't be a problem if both display are in landscape mode, however, the one connects to slot 3 is in portrait mode. :D I had 2xQuadro 4000 before and they boot just as it should, slot 1 first.:confused:

    I tried the PRAM reset and SMC reset, same result.

    TIA for any hints on how to solve this.
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    I believe Switchresx software will do this.

    Alternatively, a single 5770 could certainly handle two monitors by itself.
     
  3. goMac macrumors 603

    Joined:
    Apr 15, 2004
    #3
    Have you tried swapping positions of the cards?

    (or better yet, just swapping the cables?)
     

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