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. Create Enough Space - Check that your Mac has sufficient RAM to run the software.
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. 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.
