Although they're EFI based, this has nothing to do with the PRAM of older PPC macs, which has become less and less used since the advent of OS X which stores 99

Although they're EFI based, this has nothing to do with the PRAM of older PPC macs, which has become less and less used since the advent of OS X which stores 99% of it's settings in .plist files on the HD. the PRAM used to store all sorts of information but now I think it's probably only used to store the startup disk preference and other minor things.