New 2.66 Quad MP - safe to downgrade to 10.5.8 ?

Discussion in 'Mac Pro' started by diazj3, Nov 4, 2009.

  1. diazj3 macrumors 6502a

    Jan 19, 2008
    I got my new 2.66 Quad Core some weeks ago with 10.6. Updated to 10.6.1 as it became available. I've noticed the temperature climbing when using Safari, and - at least twice a day - the system hangs when shutting down or put to sleep, forcing me to push the power button to restart it. Sometimes I can see that'll happen when a beach-ball hangs in the menu bar area.

    Seem's to me 10.6.1 is not stable. I restored 10.5.8 from a SuperDuper backup I had from my previous iMac, to a 2nd internal drive, and it seems to boot and work OK... temperatures seem lower under Safari+Flash.... BUT:

    ... ¿Are there any negative risks or side effects of running 10.5.8 from an iMac restored backup in my new MacPro that I should be aware of? for instance - any hardware drivers missing specific for the MacPro?

    I read somewhere any new mac cannot run older OS than the one installed - specially when it's a major version (i.e. Leopard to Tiger)... perhaps this doesn't apply when restoring from a backup?

    Any thoughts or advice? Thanks!
  2. Mackilroy macrumors 68040


    Jun 29, 2006
    It still applies, but 10.5.8 wasn't the newest OS release when your machine was brand-new (the type, not your individual machine).

    It should be fine, OS X isn't really similar to Windows as far as drivers go. And it's too bad 10.6.1 isn't doing well for you, it's fantastic on my Mac Pro.

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