It was recently confirmed by Computerworld as to which Macs will be given Yosemite support. The account came directly from developers at Apple who, unsurprisingly, asked not to be named due to the fact that they were not authorized to disclose any information about the pre-release software. According to the developers, Yosemite's list of approved devices was identical to Maverick's, which was almost identical to that of Mountain Lion.
OS X 10.10 is said to be able to run on iMacs from the mid-2007 model on up to current devices as well as on 13" MacBooks from late 2008 and early 2009 onward. In addition to that MacBook Pro notebooks from mid-2009 and later and late-2007 and after are also supported which includes the 13", 15" and 17" variations. The MacBook Air laptops form late 2008 and later, Mac Mini desktops from early 2009 and after and the bigger Mac Pro desktops from early 2008 and on are also supported by Yosemite.
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To figure out if your device is able to run Yosemite you simply need to select "About This Mac" from the Apple menu and chose "More Info" from the window. The age of your Mac computer will display under the name of the model and look similar to something like "Retina, 13-inch, Late 2012" depending on your specific device.
Until the 2012 release of Mountain Lion Apple was known to regularly drop support for different machines by dumping what the company considered old as an emphasis on adding features to the operating system that would either run poorly on older machines or not run at all came into the picture. On the other hand, Apple seems to be taking note from Microsoft, who's Windows 8 and 8.1 runs on the same hardware that ran Windows 7, which runs on the same hardware that ran Windows Vista, by acknowledging that older Mac devices are good enough for the upgrade.
Net Applications, an Internet metrics company, ran a study that found that 69% of all Macs that went online in May were running wither Mountain Lion or Mavericks and will definitely be able to handle Yosemite while a portion of the systems still on 2011's Mountain Lion will also be able to run on Yosemite. Should Mountain Lion and Mavericks sustain their 90-day average losses and gains through September, which is one month before Yosemite is expected to launch, the two operating systems will be on roughly 78% of all Macs.
PC sales have decreased dramatically over the past few years, due in part to a struggling world economy. However, analysts cite the reason "good enough" as being another driving factor in the decline as well. In the past, users believed that each generation of new hardware was discernibly better than the previous and that the upgrades to the operating system were worth it because they took advantage of the increased power. However, now there appears to be little reason to upgrade hardware because the existing hardware is "good enough".
It's hard to say how users will react to OS X 10.10 Yosemite but the fact that it will be able to run on an extended number of older devices is definitely a good selling point. But who am I kidding, it's an Apple product, people are going to buy it. Apple could make the absolute worst product they've ever made and the Apple fans will eat it up like Oliver Twist looking for more porridge.