A 32bit system can access 232 memory addresses, i.e 4 GB of RAM or physical memory. A 64bit system can access 264 memory addresses, i.e actually 18-Quintillion bytes of RAM. In short, any amount of memory greater than 4 GB can be easily handled by it. So a 64bit application is suitable for memory and data intensive applications such as computer-aided design (CAD) applications with huge design file sizes.