@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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Apparently 3rd “force cache rebuild” was the charm. Mojave boots fine with my old Radeon HD 2600 (that I keep for EFI booting), but not my primary GTX770, as I’m sure you already knew.
#unblocknvidia Now to try patched High Sierra, I guess...
GTX770 will work perfectly under Mojave, but it CANNOT be in there with the 2600, or other non-Metal card. Also, if you applied the Legacy Video Card patch to get the 2600 working, you'll need to re-install.
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Reinstall the OS from step 1, without the Legacy Video Card patch, and with the 2600 physically removed? My 770 is non-EFI, so I wouldn’t be able to hold Option to select the flash drive Post-Install. How would I accomplish that?
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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 …
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