The Pentium processor's 18th birthday

We chart the ups and downs of Intel's best-loved processor

The Pentium III was similar to the Pentium II, but included SSE instruction sets. Over the course of its life it was available as both a slotted and socketed processor, and was the first Pentium to break through the 1GHz core frequency barrier. A slight controversy erupted when it was revealed each processor's serial number was readable by software — privacy concerns meant that this feature was abandoned in later models.

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