64gb RAM not compatible in High Sierra

Discussion in 'macOS High Sierra (10.13)' started by crossmiles8, Apr 11, 2018.

  1. crossmiles8 macrumors newbie


    Apr 11, 2018
    Hey there,

    I've got an early 2008 mac pro 3,1. Running OS X High Sierra using Dosdude patch. Upgraded to 64gb of RAM but get stuck on boot screen. Pulled out 2 of the 8gb DIMMs and replaced with 4gb's (64gb total down to 56gb) and all is fine. What gives? Any work around? Thanks guys.
  2. TheSkywalker77 macrumors 6502a


    Sep 9, 2017
    Did you buy the RAM exclusively for your device? And does it say 64 GB is supported for that device?
  3. crossmiles8 thread starter macrumors newbie


    Apr 11, 2018
    Yeah the RAM is fine, works okay in previous OS Versions. Just High Sierra has the issue, very strange. It's specific to the OS itself.
  4. titaniumjones macrumors newbie


    Oct 29, 2011
    That is interesting.
    I have an xServe 3.1 (Basically the same machine) but only on Sierra. I'm glad I've not upgraded yet.
    I hope someone has an answer.
    I suspect that Apple has put a software limit in, to limit the ability to install it on 'Unsupported' Macs.

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