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Message: <blockquote data-quote="harryb2448" data-source="post: 1695837" data-attributes="member: 42497">G'day and welcome to the forums.Of course Mac Pro 1.1 are cheap.  Natively the cannot run any operating system later than Lion OS X.7.  You see Apple released that model with 32bit firmware, despite having 64bit architecture.  No way you can change that firmware or we would have all done it.  The 2008 Model is 64bit fimware and will run everything up to the current release, El Capitan OS X.11.  It is possible to do a hack on the 1.1, but just be aware it is not guaranteed to work and may result in an very expensive door stop.  Suggest unloading it and buying a later model, say 2010.  Used in your office the Mac Pro will be subject to tax relief by way of depreciation.</blockquote>