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  1. #1

    Member Since
    Apr 19, 2012
    Mac Pro 1.1 cpu upgrade
    I have a 2006 MP 1.1 with two dual xeon 2.66 (5150) I have been told that because I have the first logic board (not ending in x7q) that I can't go to 8 cores because the LB won't support them. Is there much for me to gain by going to dual 5355 s, or would my processing speed be about the same ? Thx

  2. #2

    Brunhild's Avatar
    Member Since
    Oct 09, 2008
    MBP 2.26 8GB RAM 500GBhdd, iPhone 4, and iPad
    2006 mac pro CPU upgrade: where can i get... - MacRumors Forums

    this guy didnt seem to have a problem in 2009. Id do some more searching and reading if I was you but seems like you should be fine.
    my beer blog, BEERUKEN!

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.4
    Never heard that one before about the logic board. Best priced Quad Core update seems to be the Intel X5355 which run about the $100 mark each. It may be wise to hang off for a while as it is anticipated the next OS release, Mountain Lion, will run on 64bit machines only. Mac Pro 1.1 and 2.1 models are 64bit architecture, but have 32bit EFI Firmware and it is believed these machine will be excluded from further operating system upgrades.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  4. #4

    Member Since
    Apr 19, 2012
    Thanks for the info. Apparently MP 1.1 was first equipped with a logic board for which no 8 core upgrade was ever available. The second and most common board was upgradeable. I have the first version unfortunately. This is why my source thought going to 8 on my machine would be unsuccessful. The serial for the board that supports 8 ends in x7q , mine does not. If this is groundless I'd be happy to hear it. Thanks again for your help,

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