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Helpful answers
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Apr 19, 2015 1:57 PM in response to jackbivby Niel,Because it has a 32-bit EFI instead of a 64-bit one.
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Apr 19, 2015 2:00 PM in response to jackbivby pmiles,How to install OS X Yosemite on your Mac - Apple Support
https://www.apple.com/osx/how-to-upgrade/
How to identify Mac Pro models - Apple Support
A Mac Pro 1,1 is too old, hardware-wise, to run the latest OS. It's not a memory or disk space issue. It's a motherboard issue.