As we know, Apple announced the release of OS X 10.9 Mavericks, later version of the Mac OS after Mountain Lion.
But have you wondered if your current Mac could be upgraded to the new OS? The first thing to know is that to download via theApp Store on your Mac, you will need at least OS X 10.6.7 or later. This is actually less than the requirement that Mountain Lion required, which required OSX 10.6.8 for the installation.
MacBook Pro – you will need to have a 13 inches starting in mid 2009, a15 inches from the middle / end of 2007 or a17 inches from the end of 2007 or later.
Unfortunately, those Macs that will not be able to update are numerous, including all MacBook plastic model before 2008, MacBook Pro and Mac Mini / iMac before mid-2007 and in particular the original MacBook Air, the one that came out of that famous envelope.
In terms of graphics, OS X 10.9 does not support the card ATI Radeon X1600 or Intel GMA 950 or X3100. Thus, integrated graphics cards are no longer usable.
Even the versions of the Mac Pro 2006 and 2007 they will not be able to install OS X 10.9, as they could not install OS X 10.8.
Obviously all this information is based on OS X 10.9 Beta version and can change with the release of the full version.