iMac only 6MB VRAM

Discussion in 'iMac' started by basie2003, Jul 26, 2016.

  1. basie2003 macrumors newbie

    Jul 26, 2016
    So i have a Imac 5.1 (20inch, 4gb ram, ATI redeon x1600 128mb) and i installed os x yosemite trough MLPostFactor and there is a problem. It can only use 6mb while on snow leopard it could use the full 128mb! Is there any way i can fix this problem.


  2. mpe macrumors 6502

    Sep 3, 2010
    What do you mean by using VRAM? How exactly do you use it and how do you know how much you are using?
  3. Samuelsan2001 macrumors 604

    Oct 24, 2013
    I did one Google search and got this page.

    The first post says that video issues are pretty much inevitable with any OS X version after mountain lion on your video card. (Quoted below)

    OS X Yosemite on Unsupported Macs
    OS X Hackers

    OS X Extracter and MacPostFactor are apps that guide you through patching and installing OS X Yosemite (10.10), Mavericks(10.9), or Mountain Lion (10.8) on your older Mac. This thread focuses on OS X Yosemite.

    MacPostFactor works for Mountain Lion, Mavericks, and Yosemite (certain Models).
    Please note that older GPU (GMA 950, X3100, X1600, X1300, X1900, 7300gt, etc.) Graphics Acceleration on Mavericks and Yosemite is not supported yet.
    Installing on these models may cause them to have graphical issues as stated in these pages. Kexts are provided to help a little bit.
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    Sounds like you're running an unsupported OS, and have run into issues. I'd perhaps reach out to the people who made the process to install Yosemite and see what they say.

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