Core i5 is a brand name used by Intel for several microprocessors, the first of which were introduced in late 2009. It is positioned between the mainstream Core i3 & Core 2 and the high-end Core i7 & Xeon brands.
Core i5, like Core i7, is based on the Nehalem microarchitecture. The first Core i5 was introduced on September 8, 2009 and is a mainstream variant of the Core i7, initially only quad-core desktop processors based on Lynnfield, with dual-core mobile (Arrandale) and desktop processors (Clarkdale) following in 2010.
On September 8, 2009, Intel released the first Core i5 processor: The Core i5 750,[1] which is a 2.66 GHz quad-core Lynnfield processor with Hyper-threading disabled. Lynnfield Core i5 processors have an 8 MB L3 cache, a DMI bus running at 2.5 GT/s and support for dual-channel DDR3-800/1066/1333 memory.
Source [Wikipedia]
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