32-bit computing

In computer architecture, 32-bit computing refers to computer systems with a processor, memory, and other major system components that operate on data in 32-bit units. Compared to smaller bit widths, 32-bit computers can perform large calculations more efficiently and process more data per clock cycle. From the 1980s to about 2006, typical 32-bit personal computers had a 32-bit address bus, permitting up to 4 GiB of RAM to be accessed.

32-bit designs have been used since the earliest days of electronic computing, in experimental systems and then in large mainframe and minicomputer systems. The first hybrid 16/32-bit microprocessor, the Motorola 68000, was introduced in the late 1970s and used in systems such as the original Macintosh. Fully 32-bit microprocessors such as the HP FOCUS, Motorola 68020 and Intel 80386 were launched in the early to mid 1980s and became dominant by the early 1990s. This generation of microprocessor and the personal computers that used them coincided with and enabled the first mass-adoption of the World Wide Web. While 32-bit architectures are still widely used in specific applications, the PC and server market has moved on to 64 bits with x86-64 and other 64-bit architectures since the mid-2000s, with installed memory often exceeding the 32-bit address limit of 4 GiB on entry-level computers. The latest generation of smartphones have also switched to 64 bits.