Pro Tools 10 will run on Mac OS X 10.6.8 (Snow Leopard), Mac OS X Lion (10.7.x), Mac OS X Mountain Lion (10.8.x), and Windows 7 and 8. Pro Tools 10 will not work on Mac OS X Mavericks (10.9.x). It will run in both 32-bit and 64-bit operating system mode. You’ll need a minimum of 2 GB of RAM for Pro Tools 10, but 4 GB is recommended. If you’re using Pro Tools HD 10, you’ll need a minimum 4 GB of RAM, but 8 GB is recommended (even more will be helpful if you want to use the new Extended Disk Cache functionality in Pro Tools HD 10).