Mac Pro 2007 & 64bit mode

I am a little stumped..... I have a Mac Pro Dual Core Intel Xeon 2,66Ghz machine (Model Number: MacPro1,1) and I just entered this code to find out if I can boot up in 64 bit mode:
ioreg -l -p IODeviceTree | awk -F'"' '/firmware-abi/{print R27.68}'
and it told me EFI32.....
You mean this kind of machine CAN'T boot up in 64 bit mode, is this for real? Someone please tell me I am not going to have to buy a whole new mac pro just to get the processors to work in 64 bit mode? Aren't they already made to run 64 bit? Help me understand why this is a problem for this model of mac pro?

There's not a 64-bit mode per se. It's true that with a 32-bit EFI you will boot a 32-bit version of the OS X kernel and cannot boot a 64-bit version. This mainly influences what device drivers are loaded, and decides whether the kernel itself can make optimizations specific to the 64-bit instruction set of the processor.
This has *no bearing at all* on whether or not you can run 64-bit applications on your computer, or how much RAM it (or a process) can access. OS X is designed in a such a fashion that 64-bit applications are fully capable of running on the 32-bit kernel. In fact, provided a binary that has 64-bit and 32-bit, it will preferentially run the 64-bit version of the application.
This is a little different than, say, Windows. On that operating system, if you run the 32-bit version of the operating system, all of the applications run 32-bit and have an address space limited to 4G (per process, you can have >4G of RAM recognized and used by the OS, even on 32-bit versions of Windows).
In short, this should not be a problem. There's a small difference in performance of the kernel, but there's absolutely no difference with regard to applications between the 32-bit and 64-bit kernels. If you open Activity Monitor you will probably find several 64-bit applications running just fine.

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