Upgraded Core Solo --> C2D max RAM

Discussion in 'Mac mini' started by strwrsfrk, Oct 17, 2011.

  1. strwrsfrk macrumors regular

    Joined:
    Mar 1, 2011
    Location:
    Arlington, VA, USA
    #1
    Another weird question with no easy answers online:

    I bought a Core Solo Mac Mini to upgrade to a T5600 1.83GHz Core2Duo. I know this is possible; tons of people have done it and posted.

    My question is whether this enables the Mini to read more than 2GB RAM. That is the max for a Core Solo machine, but is the issue of addressing 2GB+ RAM a processor issue or is the logic board the bottleneck?

    Thanks.
     
  2. NatronB macrumors regular

    Joined:
    Jul 2, 2002
    #2
    You're still limited to 2 GB RAM.

    I'd like to make a pitch for the 2.0 Ghz T7200 Core2Duo. Lion ready (with a little bit of work).

    -N
     
  3. strwrsfrk thread starter macrumors regular

    Joined:
    Mar 1, 2011
    Location:
    Arlington, VA, USA
    #3
    Darn

    T5600 is still Lion ready. Would prefer the T7200, of course, but my budget is almost nil.

    Thanks for the info!
     
  4. weckart macrumors 68040

    Joined:
    Nov 7, 2004
    #4
    You can hack it to take more than 2GB, but that means flashing the firmware to change it from a Mac Mini 1,1 to a Mac Mini 2,1 model. It will then recognise up to 3.3GB of RAM.
     
  5. dlee27 macrumors newbie

    Joined:
    Mar 14, 2008
    #5
    Can you elaborate on details of flashing firmware? I'm very interested. Thanks.
     
  6. alust2013 macrumors 601

    alust2013

    Joined:
    Feb 6, 2010
    Location:
    On the fence
    #6
    You also will need the firmware hack to run Lion, as it will still see it as a Core Duo machine due to the chipset.
     
  7. strwrsfrk thread starter macrumors regular

    Joined:
    Mar 1, 2011
    Location:
    Arlington, VA, USA
    #7
    I read that updating to 10.7.2 requires this change, yes.

    And does anyone have a link to instructions for modifying the firmware to take more RAM? This is the first I've heard of it.
     
  8. dlee27, Oct 18, 2011
    Last edited: Oct 19, 2011

    dlee27 macrumors newbie

    Joined:
    Mar 14, 2008
    #8
    I've done it today and can confirm that 3GB of RAM works. Unfortunately, board ID is not changed this way so Lion install USB still does not run without modification. Read #46 by MacEFIRom and #67 by Sebinouse.
    http://forum.netkas.org/index.php/topic,874.0.html
     

    Attached Files:

  9. strwrsfrk thread starter macrumors regular

    Joined:
    Mar 1, 2011
    Location:
    Arlington, VA, USA
    #9
    Thanks!

    Thank you! This is awesome!
     
  10. jdreier macrumors member

    Joined:
    Dec 20, 2010
    #10
    Ok. I've read the posted thread about the firmware upgrade a couple of times now. I get most of it. It's just the crc32 check sums that confuse me. What do they actually do? I'm pretty computer savvy. I've upgraded my 1,1 mac mini to a 2.33 c2d and have successfully installed Lion on it.


    Can anybody give me a simplified walkthrough of the firmware upgrade process? I mostly just need to know how to run the crc32 stuff.

    till then i'll keep reading on the web about it.

    Thanks,
     
  11. dlee27 macrumors newbie

    Joined:
    Mar 14, 2008
    #11
    You just need to follow Sebinouse' instruction on the post.

    Open EFIUpdaterApp.efi with hex editor like Hex Fiend. Use find/replace function. Find "67 BC 27 43" and replace them with "1C 65 1E DD". There are 4 instances around offset 0x73B0. That's it!
     

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