I recommend starting with at least 20 GB of free space (before downloading the installer). But my experience suggests that in real-world use, 8 GB is cutting it too close for comfort. And, in fact, a full install of Mountain Lion can, under optimal conditions, fit in less than 6 GB of disk space. Īpple says Mountain Lion requires 8 GB of free disk space-presumably not including the 4 GB or so you’ll need for the installer itself. To see if a firmware update is available, check this Web page. Some computers may require updated EFI or SMC firmware to run Mountain Lion. Even though 2 GB is the official minimum, I strongly suggest having more, if your budget allows.
If your Mac is not on that list (or has an older model number), then regardless of its age or speed, I’m very sorry to say that it won’t run Mountain Lion.ĢGB physical RAM.
Here are the Macs that can run Mountain Lion: (Keep in mind that the comma should be interpreted as a decimal point, so 5,6 is newer than 5,5, and 6,1 is newer than 5,6.) Once you know your Mac’s Model Identifier, you can look it up in the list below. It consists of your Mac model name followed by a pair of numbers, without spaces - as in “iMac11,3” or “MacBookPro5,5.”
In the list on the left, make sure Hardware is selected, and look for the line that says Model Identifier. To find out if your current Mac has one of these processors open System Information (in Lion) or System Profiler in Snow Leopard (or earlier Mac OS X versions) it’s found in /Applications/Utilities. Your Mac must have an Intel Core 2 Duo or better, a logic board designed to boot into a 64-bit kernel as well as an “advanced GPU (graphics processing unit) chipset.” to run Mountain Lion.
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