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All replies
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Helpful answers
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Jun 5, 2015 5:15 PM in response to Zeus2400by Grant Bennet-Alder,The Mac Pro 1,1 42 lb silver tower is not supported to run Yosemite.
If you are a developer, or think like one, you can install some hacks that will allow you to run a version of Yosemite. If you wish to upgrade later, you have to install the hacks again.
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Jun 5, 2015 7:37 PM in response to Zeus2400by kaz-k,Lion is the latest OS for original Mac Pro.
As for GPU:
About graphics-card compatibility between Mac Pro models - Apple Support
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Jun 6, 2015 6:49 AM in response to Zeus2400by The hatter,What to use, how to install Yosemite, and more on a 1,1
http://forums.macrumors.com/forums/mac-pro.1/
Asked. And answered. Once you get to 10.10 versus what is it you have now....