What GPU should I get?
I'm thinking about installing macOS Big Sur on my mid 2012 Mac Pro. But the GPU doesn't support Big Sur so I plan to upgrade it. What GPU do you think is the best for my Mac?
Mac Pro
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A MacPro from 2012 cannot install macOS Big Sur.
How to upgrade to macOS Big Sur - Apple Support
Read the Check Compatibility table.
Check compatibility
macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you might be able to install an old version of macOS instead.
MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.
If upgrading from macOS Sierra or later, your Mac needs 35.5GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.