Upgrade 1.1 to 2.1 before or after upgrading processors?

Discussion in 'Mac Pro' started by les24preludes, Mar 14, 2016.

  1. les24preludes macrumors member

    Feb 6, 2011
    When upgrading a 1.1 Quad 2.66 to twin Quad core processors such as X5355 or E5345, do you do the 1.1 to 2.1 flash first, or can you do it after fitting the new processors? Or to put it another way, will the new 8 core processors also run in 1.1 in some way, even if not optimally?
  2. redheeler macrumors 603


    Oct 17, 2014
    It will run fine with the quad-core processors installed, they just won't be identified properly in About This Mac/System Profiler until you flash to 2,1. So you can flash it before or after the CPU upgrade, it doesn't matter.
  3. owbp macrumors 6502a


    Jan 28, 2016
    Belgrade, Serbia
    I'm already running 2,1 although i I'm yet to upgrade CPU. It's all ok.
  4. les24preludes thread starter macrumors member

    Feb 6, 2011
    Thanks guys - that's all I need to know to go ahead.

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