@dosdude1 First boot into patched Mojave, Mac Pro 3,1 using APFS. How long should I wait on a frozen progress bar Apple screen? I booted back to the USB and forced cache rebuild to no avail. 
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MacVidCards says the GTX770 has full Metal support for Mojave in 4,1 and 5,1 Mac Pros. Mine is a 3,1. Could that be the problem? http://www.macvidcards.com/store/p9/Nvidia_GTX_770_2_GB_and_4_GB.html …
You can do the installation and post-install tool with the original EFI-compatible video card installed, just don't apply the Legacy Video Card Patch, and re-install the GTX770 once you're done.
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Hmm. Without my EFI card installed, I can’t Option-boot to select my Mojave drive, and I can’t set it as the Startup Disk in Preferences using my El Capitan drive, presumably because it doesn’t recognize APFS?
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Boot to it using your EFI video card first, then set the startup disk.
End of conversation
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Sweet! I’ll give it a shot tonight. Thank you for the help.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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