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32 bit vs. 64 bit EFI ?

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On those older Mac Pros that shipped with unsupported graphics cards, Apple hasn't deigned to update their firmware to support 64-bit EFI. You can run this command in Terminal to see whether you have a 32-bit or 64-bit EFI:

ioreg -l -p IODeviceTree | grep firmware-abi

All of the Macs dropped by Mountain Lion are going to return "EFI32"


Maybe a database of "64 bit EFI" bios video cards & motherboards should be compiled, if not already done.

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