Quote:
Originally Posted by vdbucks
your 2009 machine running 2 9800's is still running 10.5, maybe 10.6..
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I had to research this a bit to see just how wrong you were. Even a Mac Pro Desktop from 2006 (the first one to come out) can run 10.7 (Lion) officially, and without any issues. And if you upgrade your GPU and emulate EFI64, you can run 10.8. Everything from early 2008 and up is fully supported by Apple for 10.8.x (Mountain Lion).
My machine, a 2009 Mac Pro, has EFI64 out of the box. It's a 64-bit kernel, just like a 2012 Mac Pro. It's an Intel X58 Chipset, just like a 2012 Mac Pro. Same system bus. Same memory. Same supported operating system: Mac OS X 10.8 "Mountain Lion".
http://en.wikipedia.org/wiki/Mac_pro