Is it possible to upgrade my old mac pro 1.1 with hardware so i can get mountain lion?

Not practically. Even if remotely possible it would cost as much as an entry-level MBP in the refurb store and you very well could end up with an unstable device.

The other problem is the form factor. Newer logic boards won't line up with the ports on your case.

nope

Even if you could get that "everything" part, the logic board in (which you cant), it would cost 85% of a new or like new macbook

You can still go to 10.7 if you have enough RAM. You have to call The Apple online store and order a download code.

<nevermind>

System requirements for OS X Lion and Mac OS X v10.6

OS X Lion system requirements

To use Lion, make sure your computer has the following:

• An Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
• Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended); you can install without Mac OS X v10.6 by using an OS X Lion USB Thumb Drive [no longer available]
• 7 GB of available disk space
• 2 GB of RAM

If your Mac does not meet these requirements, you will need to upgrade your Mac before installing Lion.

HOW it manages to do this trick when it does not support 64-bit kernel is something I do not know.

Best bet today, OWC selling 4,1's for $850 and up and those can be upgraded from there to ML, 48GB, 5,1 firmware, a W3680 3.33 6-core

logicboard, not, and $600 bracket.

Yet you have much less GPU power and it runs an inferior OS.