Second video card with third monitor doesn't work.

Discussion in 'Mac Pro' started by checkmate2006, Mar 1, 2014.

  1. checkmate2006 macrumors newbie

    Jan 27, 2014
    My Mac Pro is a
    2006 Mac Pro running Mavericks
    Upgraded Dual X5355 Quad-core 2.66ghz
    ATi 5770 Mac Edition driving Dual 20in Apple Displays
    Nvidia 7300GT driving single 21in AOC Display

    My issue is when I was running Lion the 7300GT worked perfectly but as soon as I went to Mavericks I discovered that it no longer worked. I am wondering what the solution would be? I had read somewhere that Mavericks doesn't like mixed cards i.e. ATi and Nvidia.
  2. 666sheep macrumors 68040


    Dec 7, 2009
    Mavericks doesn't like 7300GT - lacks 64-bit driver for it. That's why card has only 9MB RAM in system profiler and no QE/CI.
  3. checkmate2006 thread starter macrumors newbie

    Jan 27, 2014
    Need recommendations for cheap Mavericks compatible video card this is a secondary card.
  4. Macsonic macrumors 65816


    Sep 6, 2009
    Since you are using the Radeon 5770HD, perhaps a second 5770HD like PC flashed is cheap. A friend of mine told me to use the same brand of GPUs to avoid compatibllity issues. Radeon with another Radeon brand. Avoid Radeon 2600XT as it's not a durable card. Other choices would be PC flashed Radeon 4870 or 5850 but this uses two 6 pin power cables. You will need a Y-splitter power cable. As far as I know they will work with a 2006 1.1 Mac Pro.

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