You will also need to delete some unnecessary files to create more space for the installation of El Capitan. Apple recommend that you have a minimum RAM of 2G, however, a minimum of 4G space of RAM is highly recommended. You wouldn’t run into any hitches if your Mac device is listed on the acceptable Mac devices for Mac OS X El Capitan.
You can also check this list on the “Will your Mac run Mac OS X” article on Apple website.
Apple has provided a list of the Mac supported by the new Mac OS X El Capitan and if you are already running the Mavericks or Yosemite, the same lists may also apply to the El Capitan. Check Your Mac - Check whether your Mac will be able to run the new OS X 10.11.Just before you install the new Mac OS X El Capitan, you must perform few tasks to ensure that your Mac will be ready for the installation of the software: Preparing Mac Device for the Installation of Mac OS X El Capitanīoth Mavericks and Yosemite are easier to download and install on Mac devices, however, this is not the case with Mac OS X El Capitan.
