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Originally Posted by CEMatt  Don't know about the new Mac Pro's, but my quad-core 2.66 GHz Mac Pro boots both just fine. I have Leopard on one HD and Tiger on another. I have bootable backups of both systems on an external Firewire 800 HD. |
Well yes, and your 2.66 MacPro shipped with Tiger, so you could easily do that, and the newer Leopard, too. Even if you bought your 2.66 after the release of Leopard, a system that is known to boot to Tiger may still be OK with Tiger (if you can locate a restore disk that will work, the black commercial OS X 10.4 won't install on any Intel Mac.) The newest MacPro ships with Leopard or later, and you can't go back to an older OS.