richtig Posted July 11, 2012 Share Posted July 11, 2012 http://arstechnica.c...hat-good-night/ 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. Link to comment Share on other sites More sharing options...
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