Mac ProDate introduced
Original Mac OS X included
(see Tips 1 and 3)
Later Mac OS X included
(see Tip 1)
Mac OS X Build(s)
(see Tip 2)
Mac Pro (Mid 2012) Jun 2012 10.7.3 10.8 11D2001, 12A269 Mac Pro (Mid 2010) Aug 2010 10.6.4 10.7, 10.7.2, 10.7.3 10F2521, 10F2554, 11A511a, 11C74, 11D2001 Mac Pro with Mac OS X Server (Mid 2010) Aug 2010 10.6.4 10.7, 10.7.2, 10.7.3 (Server) 10F2522, 11A511a, 11C74, 11D2001 (Server) Mac Pro (Early 2009) Mar 2009 10.5.6 10.6 9G3553, 10A432 Mac Pro (Early 2008)
9B2117, 9C2031, 9E25 Mac Pro
10.4.8, 10.4.9, 10.4.10, 10.5
8K1079, 8N1430, 8N1250, 8K1124, 8P4037, 8R3032, 8R3041, 9A581, 9A3129
The 2012 model has the same firmware as the 2010 model, so you should be able to run the same 10.6.4[custom] or later.But you cannot do so by booting from the "Full Retail" 10.6.3 DVD.
a) contact Applecare with your serial number at the ready and request a "replacement disc" for the one that shipped in the box. This sometimes will require pushing past the "first responders" who have never heard of such a thing until you get to a product specialist who has heard of it and can send you one. If available, the nominal cost of about US$25 brings a white DVD-R "Replacement DVD -- Not for ReSale", possibly of the aforementioned 10.6.4[custom]. -OR-
b) create a 10.6.5 or later (10.6.8 would be best) on another drive on another computer. As long as it was sourced from a "Full Retail" DVD and not a "model-specific" DVD, you should be able to clone it to that Mac Pro and have it run properly. [Remember that Disk Utility Restore, even the version on a bootable DVD can also be used to copy disks, and that FireWire Target Disk Mode can also come in handy here.]
This solution has proven to be superb! I can now run My Mac Pro in a dual boot mode with either OS 10.7.5 or OS 10.6.8, choosing one or the other through System Pref. Startup Disk. I cannot thank Roy Miller enough for his persistence and expertise as well as generously giving support to all who needed it.
It is a lengthy discussion and several other folks lent effort to the fray that are to be thanked as well.
My specific requirement, getting some older expensive hardware to work in OS 10.7 or later, that is, writing appropriate drivers, was not going to happen according to the manufacturer. So, OS 10.6.8 was the last best chance!
Thanks to you for bringing this to my attention!