4.1 tray in 5.1 ?

Discussion in 'Mac Pro' started by v1nce29, Sep 8, 2015.

  1. v1nce29 macrumors newbie

    Sep 8, 2015
    I got a 5.1 1xCPU
    I wanted to upgrade to a 2xCPU so I bought a 2xCPU tray that was supposed to be a 5.1.

    When I plugged it into the system the fans turn mad (but I can reach the desktop)
    I investigate a bit and, for me, the tray appears to be a 4.1 because its firmware is 1.39f5 (when system is 1.39f11)

    Is there any chance I can use it into my 5.1 system ?

    I tried to upgrade using http://www.yourdailymac.net/downloads/MacPro2009-2010FirmwareTool.zip
    (as seen in

    and I can't only downgrade.
    (Which I suppose would brick my mac as it would not reckognized the CPU)

    Can I try to downgrade (the system => 1.39f5) without bricking my mac ?
    Then would I be able to upgrade both smc (or at least the system) ?

  2. RoastingPig macrumors 68000


    Jul 23, 2012

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