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Helpful answers
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Mar 5, 2014 1:34 PM in response to Dave01by The hatter,The App Store is going to know based on your Apple ID that you need the OEM Mavericks for your new "Late 2013 Mac Pro 6,1"
Mac Pro (Late 2013) Dec 2013 10.9 13A4023 http://support.apple.com/kb/HT1159#mac_pro
http://support.apple.com/kb/HT1633
You should always use the latest version of OS X. You can get updates from the Mac App Store (in Mountain Lion), Software Update pane of System Preferences, or from Apple Support Downloads. To find build numbers for specific Mac computers, refer to OS X versions (builds) for computers.
The recent firmware update 2.0 can also play a factor.
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Mar 5, 2014 1:38 PM in response to Dave01by The hatter,One person that does a lot of testing and also running customized versions of the operating system uses VMware (Parallels works well, slightly better responsse but also more issues) so they can test on the VM and use a master system image, and then commit a VM back to a new system restore image.
All on a nMP and running host Mavericks and running VMs of Mavericks and also earlier versions - and of course can't run Moutain Lion or early natively on nMP's.