Success story here.
GA-P55M-UD2 F11, i7 870, 16GB Ram, Radeon 5870, 'Mac Pro 3,1'.
Trying to boot off a USB key froze the system at BIOS. Switched to xMove method. Have existing Lion install, cloned to second disk, then upgraded the clone.
Updated all disks to latest Chimera.
Used...