ML on 4.1 to 5.1 Mac Pro Upgrade

Discussion in 'OS X Mountain Lion (10.8)' started by xav8tor, Jul 19, 2012.

  1. macrumors 6502

    Mar 30, 2011
    I know the OS and firmware are, in theory, independent, but has anyone actually installed/used Mountain Lion on a 4.1 Mac Pro with the 5.1 firmware? If so, any issues? Thanks!
  2. macrumors newbie

    Mar 27, 2007

    I have successfuly upgraded my Mac Pro 2009 quad 2.66 4,1 to 5,1 firmware. I replaced the CPU with a six core 3.33 Intel Xeon W3680. I did that yesterday, on Mountain Lion with no trouble at all.
  3. thread starter macrumors 6502

    Mar 30, 2011
    Thanks for the reply. That is good news. I'll soon attempt it myself.

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