Has anyone successfully upgraded a Mac Pro 1.1 to a 64 bit kernel? Seems like it would be a simple firmware update, but I want to ask the experts. It may of course be much more to it. I have an idea that my expensive computer will be outdated in the next couple of years meaning no new OS's past OS v10.7. I have already updated my Mac Pro with Xeon E5345's.

as long as you have snow leopard and an intel processor its as simple as restarting and and holding down the 6 and the 4 key on your keyboard. Im running the 64-bit on my 2008 Mac Pro 8-core. After you restart you can check and make sure you're running it by going to system profiler, then clicking on the sidebar that says software and it should say 64-bit yes or no. Or you can always google K64 enabler.

Hope this helped.

as long as you have snow leopard and an intel processor its as simple as restarting and and holding down the 6 and the 4 key on your keyboard. Im running the 64-bit on my 2008 Mac Pro 8-core. After you restart you can check and make sure you're running it by going to system profiler, then clicking on the sidebar that says software and it should say 64-bit yes or no. Or you can always google K64 enabler.

Hope this helped.

Exactly what i was gonna say. Hold on startup 6 and 4

Not so fast... at the moment it is not possible to boot k64 on a mp1,1. As the OP stated it's missing EFI64. Hopefully someday.

so anyone thinks that this will change soon or any other alternative. if not i probally have to buy a new Mac (again!)