An Intel processor that built on the structure of the Pentium II, but added a number of enhancements to speed and processing power.

An Intel "Slot 1" family processor that includes 70 multimedia instructions (known as SSE, or Streaming SIMD extensions) not found in the Pentium II. Newer Pentium IIIE processors are also known as "Coppermine."

Intel’s budget processor for desktop computers.

A processor range by Intel as the successor to the Pentium II. Speed range from 450Mhz to 600MHz. The package type was a small daughterboard with an edge connector that fits into a slot on the motherboard. This slot is called "Slot 2" and is not to be confused with "Slot 1" or "Slot A". Pentium III's use a 100MHz bus. A heat sink with a double fan must be fitted to keep it cool. See also Processor, Bus, Slot 1 and Slot A.

The Pentium III is an x86 (more specifically, an Intel P6) architecture microprocessor by Intel, introduced on February 26, 1999. Initial versions were very similar to the earlier Pentium II, the most notable difference being the addition of SSE instructions and the introduction of a controversial serial number which was embedded in the chip during the manufacturing process. As with the Pentium II, there was also a low-end Celeron version and a high-end Xeon version.