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Jul 30, 2014 6:54 PM in response to askaquestionandanswerby Kappy,Upgrading to Mavericks
To upgrade to Mavericks you must have Snow Leopard 10.6.8 or Lion installed. Download Mavericks from the App Store. Sign in using your Apple ID. Mavericks is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
OS X Mavericks- System Requirements
Macs that can be upgraded to OS X Mavericks
1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
Are my applications compatible?
See App Compatibility Table - RoaringApps.
See the above for what you need if you want to run Mavericks or Yosemite. I would recommend sticking with a 2009 model. Avoid the 2010 models because they have had awful GPU failure issues. Late 2011 is a pretty reliable model. Stick with models that will accept at least up to 8 GBs of RAM. This should include all that I have suggested.
You can upgrade the HDDs and/or add an SSD, but you can't change the CPUs or GPUs, so they will not be as fast as a new model.