HT201364: OS X Mavericks system requirements
Learn about OS X Mavericks system requirements
Q: why isnt it posible to install mavericks on a old Pro Mac with dual intel xenon prosesors ?!
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Jul 30, 2014 11:47 AMby kahjot,Helpful"First and second generation of Mac Pros (Mac Pro1,1 and Mac Pro 2,1) have 32bit EFI and because of that, since Mac OS 10.7 Lion there has been no easy way of installing higher versions of Mac OS on them."
It's possible with a fair amount of tinkering, though.
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Jul 30, 2014 11:52 AMby John Galt,... why isnt this possible ?
The specific limitation is due to the original Pro's GPU capability, which can only be circumvented through "hacks" that go beyond the scope of this support site for a number of reasons - including violating Apple's OS X license agreements and this site's terms of use.
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Jul 30, 2014 12:35 PMby John Galt,It's all here: https://www.apple.com/osx/how-to-upgrade/
Yes, it's a 64 bit CPU... but the EFI isn't.
This seemingly insignificant distinction resulted in a lot of disappointed Mac Pro users.
Like everything else, you have to read the fine print.
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Jul 31, 2014 5:22 AMby kahjot,A bit of searching at http://www.xlr8yourmac will turn up info on how you can get your machine past Lion. Something to try if you're feeling frisky.
