The working capacity of a 32 bit system is roughly 2 ^ 32 and the range can vary depending on the integer representation. Roughly in the unsigned state, 32 bit can run up to 2 ^ 32 = 4,294,967,295. Similarly, a 64 bit system doubles and can run up to 2 ^ 64 = 1.8 * 10 ^ 19. In other words, 64 bit data transfer rate is almost twice as fast as 32 bit. For one thing, we can only use up to 4 Gb of RAM in a 32 bit system, which is the maximum limited amount of a 32 bit system. However, with special chips, the OS can increase the RAM on 64 bit systems using the Physical Address Extension (PAE) system