HT201364: OS X Mavericks system requirements
Learn about OS X Mavericks system requirements
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Helpful answers
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Dec 26, 2014 5:50 AM in response to marianne203by keg55,Yes, but back up your system first.
If your Mac came pre-installed with OS X Lion or Mountain Lion, you can use Internet Recovery (Command+Option+R) to boot into Apple's servers. From the OS X Utilities Menu, you can use Disk Utility to erase your Macintosh HD then close that and select the Reinstall OS X Mac option from the Menu.
If your Mac came pre-installed with OS X Snow Leopard, you can use the installation DVD to erase your Macintosh HD and install Snow Leopard.