So glad I found this thread. Made a bootable backup of my MacPro 1,1 got a windows GeForce 210, created the USB and installed right overtop of my backup (Unpluged all my other drives to be safe) and it booted up as if was a perfect upgrade. All my apps are there and everything seems to be working very well so far. Still have to test everything to make sure but worst case I will do a fresh install.