All content processed or stored on a computer, including textual characters, numbers, and computer instructions, are stored as sequences of zeroes and ones. The figure below shows some basic units of data used by computers. A bit is the smallest discrete unit of storage that can be stored. Each bit can hold only two states: 0 (zero) or 1 (one). Eight bits make up one byte. Each byte can represent 2 8 = 256 unique combinations of zeroes and ones. In addition, each computer has a computer word size. In this context, word size refers to the number of bits a computer’s CPU can process at one time. So computers with larger word sizes have a processing advantage. Today’s computers typically use word sizes of 32 or 64 bits. A 32-bit processor uses a 32-bit (four byte) word size and a 64-bit processor uses a 64-bit (eight byte) word size.
Inside the computer, each character is represented by a unique sequence of eight zeroes and ones, stored as a byte. For example, the capital characters of “I” and “S” are represented by  and , respectively.
A computer with a 32-bit word size would have to process two computer words in sequence because four bytes represents 32 bits. Conversely, a 64-bit computer could process all of these characters at once because 8 bytes represents 64 bits, a single computer word.
An ERP system is a set of integrated programs that manage a company’s vital business operations for an entire organization across each functional area—even for a complex, multisite, global organization. This is the system that fills in all of the spaces in the triangle figures above. When you hear ERP, think, the “system that does everything.”
64-bit computers also have an advantage over 32-bit computers when processing numbers because larger computer word sizes mean that larger numbers can be processed at once.
For example, the computer word size indicates the largest integer a computer can process in a single instruction. The word size also determines how much memory the processor can address. A 32-bit processor is limited to 232 ≈ 4 billion memory addresses, each of which holds one byte. Hence, 32-bit PCs and Macs are limited to a maximum of 4 gigabytes of RAM (see table below).
Theoretically, a 64-bit computer can access 264 ≈ 16.8 terabytes of memory, but computer manufacturers limit the amount of RAM to 128 gigabytes(though few computers ever have that much).
In Summary, a 64-bit computer has significant advantages over a 32-bit computer because it is possible to use more than four gigabytes of RAM. Some applications like databases, data mining applications, and sophisticated video games perform much better with more than 4 gigabytes of RAM. The table below offers a guide to understanding and comparing the different levels of storage capacity.