Strange Graphical Problem with Mavericks and AMD 7850

Discussion in 'Mac Pro' started by Troy2000, Jan 5, 2016.

  1. Troy2000, Jan 5, 2016
    Last edited: Jan 5, 2016

    Troy2000 macrumors regular


    Oct 21, 2009

    I have a Mac Pro (4,1) running Mavericks (10.9.5) with an AMD 7850 (non-EFI) and have been experiencing bizarre graphical artifacts as can be seen below.

    Dragging windows around is very stuttery and exhibits peculiar duplication artifacts. If I disable vsync (demonstrated in the video), the artifacts disappear and dragging windows becomes perfectly smooth at the cost of introducing tearing.

    These issues do not occur with this GPU under any version of OS X other than Mavericks. Stranger still, neither my 7750 (non-EFI) nor GTX 680 (EFI flashed) produce these issues under Mavericks.

    If anybody could shed some light on this bizarre situation, I would be very grateful.

    Thank you,

  2. 666sheep macrumors 68040


    Dec 7, 2009
    Bugs in drivers for officially unsupported cards aren't unusual. Love it or leave it.

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