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Nehalem is the codename for an x86 microarchitecture developed by Intel. Along with the later Westmere (see below), it represents the first generation of the Intel Core i7, i5, and i3 processors, which was released in November 2008.

Nehalem processors were manufactured on a 45nm process and reintroduced the Hyper-Threading feature, first seen on the Pentium 4 but dropped in the Core 2 series, which enables each processor core to concurrently run multiple threads, increasing performance with heavily-threaded tasks. The microarchitecture was succeeded by Westmere in 2009 and Sandy Bridge in 2010.

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