2007 Mac Pro Tower with Mountain lion. Do i need any hardware upgrades to get this happening?

Unfortunately no, the 2006 and 2007 Mac Pros cannot be upgraded to Mountain Lion in any way. EFI is a separate, hard-wired part of the system from the CPU, which indeed is 64-bit.

Matt

The 2.66 is a Mac Pro 1,1, it is over 7 yrs old. Good run.

Even the 2008 which was the first to have 64-bit EFI firmware is not fully UEFI compliant.

Someone else earlier this week asked the exact same. Same answer. Wait for new model or buy a Mac that is supported. You would probably need to do more updates to yours. Stay with what you have, cheap to add an 8-core 5355 set of cpus and in a year jump to 10.9 and Mac Pro 6,1 if you can't work on yours.

I have installed Mountain Lion on my 2007 MacPro1,1.

It's not easy, but can be done.

You need the Radeon 5770 graphics card.

You need to run from OSX Lion.

You need the Chameleon app. to provide the needed EFI64.

You need to have an extra HDD installed in one of the Optical drive bays for the Chameleon installation...I used an old IDE drive in the lower bay.

I used the instructions from this link: http://www.jabbawok.net/?p=47

Good luck.

And it isn't supported, you may have trouble like most when Apple issued 10.8.4 updates.

It may not technically be "Hackintosh" but it is using the same procedures and methods which is why I for one don't bother mentioning it. There are sites with their own forums that may.

You need to be a developer, or think like one, to sue those tools. You also need a bit more RAM Memory.

WHEN (not IF) you have problems, you need to be able to debug and support that solution yourself. It is not for "regular" trouble-free use.