HT201364: OS X Mavericks system requirements
Learn about OS X Mavericks system requirements
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Helpful answers
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Jan 22, 2015 8:53 PM in response to Senecakidby Allan Eckert,No. That Mac Pro can not be upgraded to Yosemite because it has 32 bit EFI and Yosemite requires 64 bit EFI.