HT201260: Find the OS X version and build number on your Mac
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Q: Can OSX 10.5.8 build 9L31a be upgraded?
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Feb 2, 2015 3:53 AMby seventy one,You will need to buy the OS X 10.6.3 Snow leopard disk from the Apple on line store and then software update to 10.6.8. Your machine should be intel core 2 Duo. Be aware, you may need 2Gb of RAM to run Snow Leopard depending on what other things you have running in the background.
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Feb 2, 2015 8:52 PMby a brody,Upgrading to 10.7 and beyond is not wise, unless you have all Intel Apps:
http://discussions.apple.com/docs/DOC-6271
A CoreDuo will run up to 10.6.8. Core2Duo with the right applications can run at least through 10.7.5.
