4fb079fb_lkman___Phone_specs_comparison__Hardware
[1] 288 MB RAM / 512 MB ROM [2] 512 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 Ericsson XPERIA X2a vs Sony Ericsson Live with Walkman - Phone specs comparison