Any hint on which of the 2 graphics cards on a Mac Pro 2013 is giving a graphic problem?

By rodion15
Sep 10, 2015
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  1. I'm diagnosing a mac pro 2013 that sporadically shows red dots when two monitors are connected to two different thunderbolt ports.

    This may mean that one of the 2 graphic boards is faulty, but, how could I know which one, is there anyway to know which of the 7 ports (6TB + 1 hdmi) go to which of the two graphic boards? Or does each of the ports use the two graphics boards at the any time?
     

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