Screen flickering - Mac Pro 1,1 with El Capitan and 7300 GT

Discussion in 'OS X El Capitan (10.11)' started by MortenMoulder, Feb 21, 2017.

  1. MortenMoulder macrumors member


    Feb 20, 2017
    Today I finally got El Capitan working on my Mac Pro 1,1. However, everything is flickering and I can't figure out why. When I load up system information, it says 8MB VRAM instead of the 256MB VRAM it normally has.

    I would normally install a driver on Windows, but on OS X I'm kind of new to this "3rd party" stuff. I know kexts and so on, but I have no idea if finding the right one would work or anything like that.

    Anyone know what's up? It looks like it's only hardware accelerated apps, but same issue even if I turn hardware acceleration off.

    Any help is highly appreciated! Thanks.
  2. jbarley macrumors 68040


    Jul 1, 2006
    Vancouver Island
    A common and well documented issue..

    Here is a short quote from this Link

    "The 64-bit EFI loader is not optimized to work with graphics cards smaller than 512 MB. The catch-22 here is that if you run a larger PC card, you will not see the verbose screen upon start up. The card will not initialize until OSX’s GUI loads, so your Mac Pro will not send signal to the monitor until fully booted. Conversely, if you stick with the Geforce 7300GT or one of the other earlier GPUs under 512 MB designed for variants of the Mac Pro, OS X will read it as a 5 MB or 7 MB graphics card instead of the 256 MB that it is. Ideally, you’ll want to have a Mac compatible card that is at least 512 MB during upgrades such as the Geforce 8800 GT."
  3. MortenMoulder thread starter macrumors member


    Feb 20, 2017
    Ah damn, that sucks! So I'm forced to go out and buy/aquire a better GPU? That sucks :( Oh well, I might have some old AMD 5450 laying around or something. I know I have a GTS 450, but whether it works is unknown.
  4. fhenry macrumors regular

    Feb 28, 2012
    The gts 450 will work
  5. pva_glue macrumors newbie


    Jan 23, 2018
    yeah same I have same flickering issue with showing ->"OS X will read it as a 5 MB"
  6. grooby macrumors newbie


    Mar 1, 2018
    I had a GTX 460 working without needing to install the Nvidia Web driver. I still ended up installing the web driver.

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