IBM introduced dual core Power 4 CPUs in 2000, followed by Sun and HP in 2004 and x86-based Pentiums in 2005. A year later, Intel added dual cores to its Itanium line. In the late 2000s ...
(see Intel microarchitectures ... In early 2006, and based on the existing Pentium M (mobile) architecture, the dual core, 32-bit Core Duo was the first chip introduced with the Core brand.