- published: 03 Aug 2011
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A multi-core processor is a single computing component with two or more independent actual processing units (called "cores"), which are the units that read and execute program instructions. The instructions are ordinary CPU instructions such as add, move data, and branch, but the multiple cores can run multiple instructions at the same time, increasing overall speed for programs amenable to parallel computing. Manufacturers typically integrate the cores onto a single integrated circuit die (known as a chip multiprocessor or CMP), or onto multiple dies in a single chip package.
Processors were originally developed with only one core. In the mid 1980s Rockwell International manufactured versions of the 6502 with two 6502 cores on one chip as the R65C00, R65C21, and R65C29, sharing the chip's pins on alternate clock phases. Other multi-core processors were developed in the early 2000s by Intel, AMD and others.
Multi-core processors may have two cores (dual-core CPUs, for example, AMD Phenom II X2 and Intel Core Duo), three cores (tri-core CPUs, for example, AMD Phenom II X3), four cores (quad-core CPUs, for example, AMD Phenom II X4, Intel's i5 and i7 processors), six cores (hexa-core CPUs, for example, AMD Phenom II X6 and Intel Core i7 Extreme Edition 980X), eight cores (octa-core CPUs, for example, Intel Xeon E7-2820 and AMD FX-8350), ten cores (deca-core CPUs, for example, Intel Xeon E7-2850), or more.
1979 (MCMLXXIX) was a common year starting on Monday (dominical letter G) of the Gregorian calendar, the 1979th year of the Common Era (CE) and Anno Domini (AD) designations, the 979th year of the 2nd millennium, the 79th year of the 20th century, and the 10th and last year of the 1970s decade.