89b5b414_S_III___Phone_specs_comparison__Hardware
[1] 2048 MB RAM [2] 1024 MB RAM [Hardware] 
System memory System memory - System memory, or RAM memory is the type of memory that the device uses to temporarily store data from the OS or currently-running apps. The more RAM available to the device, the better the performance will be when multiple or heavier programs are running.
Sony Xperia Z1 vs Samsung Galaxy S III - Phone specs comparison
Hardware