Mac OS X Yosemite is the eighth major release of Mac OS X (now named macOS), Apple's desktop and server operating system for Macintosh computers.
OS X Yosemite Requirements
- MacBook Air (late 2008 or later)
- MacBook (late 2008 aluminum or later)
- MacBook Pro (mid-2007 or later)
- iMac (mid-2007 or later)
- Mac mini (early 2009 or later)
- Mac Pro (early 2008 or later)
- Xserve (early 2009)
- 2 GB RAM minimum (I recommend a minimum of 4 GB of RAM)
- 8 GB of drive space minimum. For basic installation, with only the default apps plus one or two of your own favorites, then 16 GB is a practical minimum.