Versions of OS X after Lion (OS X 10.7) are no longer supported on the early Mac Pro versions, as the 32-bit bootloaders on these legacy systems don't support the newer, 64-bit only OS X releases. This is for comparability reasons, as newer software will definitely require more resources than your Mac can provide (I expect RAM to be the major. There are times when your Mac may misbehave and refuse to boot into OS X. You may get a sad Mac face, an audible beep, or another ailment keeping your Mac from properly booting.
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Apple T2 chip.
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December 2020
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