1. Dark_Blu's Avatar
    How much memory does the Mac Pro 1,1 address? I'm going to be stuck on the 32bit OSX Lion and am about to drop in 8GB of RAM in my Mac Pro 1,1. How much of the RAM will my Mac Pro 1,1 address? Just curious, as I know that 32bit Windows only addresses 2.9 GB of RAM at the most.
    11-15-2013 04:33 PM
  2. Trees's Avatar
    I assume that 1,1 = 1.1 or '11.

    If '11, then don't see a Mac Pro that was released in 2011.
    Apple - Support - Technical Specifications

    So I checked the Mid-2010 version.
    Mac Pro (Mid 2010) - Technical Specifications
    Looks like up to 64GB RAM is supported.
    These links may help you determine if your Lion version has a 64-bit kernel available.
    OS X: Starting up with the 32-bit or 64-bit kernel
    https://discussions.apple.com/thread...art=0&tstart=0
    11-15-2013 06:13 PM
  3. Dark_Blu's Avatar
    No, not 2010. Mac Pro "Quad Core" 2.66 (Original) Specs (Mac Pro, MA356LL/A, MacPro1,1*, A1186, 2113) @ EveryMac.com According to this, Apple supports 16GB on this model, so dropping 8GB in, is no problem.
    11-15-2013 09:14 PM
  4. Trees's Avatar
    OK. That helps. Think you'll want to determine if Lion has a 64-bit kernel and drivers that works with your system hardware, etc.
    11-15-2013 09:29 PM
  5. Dark_Blu's Avatar
    According to this, it's a 32bit kernel- "Darwin Kernel Version 11.4.2: Thu Aug 23 16:26:45 PDT 2012; root:xnu-1699.32.7~1/RELEASE_I386 i386". Since all of my software and hardware works with the 32 bit kernel, I see no reason to boot into the 64 bit kernel.
    Last edited by Dark_Blu; 11-15-2013 at 11:14 PM.
    11-15-2013 11:03 PM
  6. Trees's Avatar
    Per this KB, can you boot with and run the 64-bit kernel?
    OS X: Starting up with the 32-bit or 64-bit kernel
    11-15-2013 11:10 PM
  7. Dark_Blu's Avatar
    I was just curious to know if there was a similarity between how a 32 bit Windows has the 2.9GB memory limitation and if Mac OSX 10.7.5 running on my First Gen Mac Pro, might have a similar limitation with the OS running in 32bit mode. If so, then that is a reason to start with the 64 bit kernel by pressing 6 and 4 at boot. I will make that attempt after the RAM arrives and is installed, next week.
    11-15-2013 11:18 PM
  8. Trees's Avatar
    I see. I'm somewhat familiar with the 32-bit OS limitations on Windows. Not so much for older OS X versions. Hope your upgrade plans go well.
    11-15-2013 11:31 PM

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