Mac OS X Mavericks Requirements

OS X Mavericks is to be the next major release by Apple for desktop and server operating systems for Mac computers.  OS X Mavericks is the next step for the Mac OS after Mountain Lion.  OS X Mavericks is scheduled to be released this fall but is currently available in beta version for developers.  To upgrade to OS X Mavericks some requirements must be met.

One of the first requirements is that you will need to have OS X Snow Leopard or later.  OS X Snow Leopard or later is required because it needs to be downloaded via the Mac App Store.  In addition, the system requirements call for 64-bit, Intel-based Macs with 8GB of free disk space for installation.

The list of Macs that will run Mavericks is similar to those that were able to use OS X 10.8 Mountain Lion.The following is a list of Macs and OS X Mavericks compatibility:

• MacBook Pro - you'll need to have either a 13-inch from mid-2009, 15-inch from mid/late 2007 or 17-inch from late 2007 or later
• MacBook - 13-inch 2008 from 2008 in aluminum, early 2009 or later
• iMac - it needs to be mid 2007 or newer
• MacBook Air - it needs to be at 2008 or newer
• Mac Mini - it needs to be early 2009 or newer
• Mac Pro - it needs to be early 2008 or newer
• Xserve - early 2009

The list of Macs that won't be able to upgrade to Mavericks is long.  MacBooks pre 2008, pre mid 2007 MacBook Pros and Mac Mini/iMac and most notably the original MacBook Air will not be able to be upgraded.  

References:
http://appleinsider.com/articles/13/06/11/macs-capable-of-running-os-x-mountain-lion-likely-compatible-with-os-x-109-mavericks
http://www.techradar.com/us/news/computing/apple/os-x-mountain-lion-compatibility-will-your-mac-take-it-1064310