Intel's consumer line of x86 CPUs (the high-end x86 line is branded with the Xeon name (see Xeon). Starting in 2006, the Core chips superseded the 13-year run of the Pentium, and Pentiums were relegated to lower-cost, entry-level PCs. The Core name was assigned to three different architecture families summarized below, starting with the most recent. See microarchitecture and Pentium. Core M Introduced in 2014, Core M is a family of power-efficient CPU chips targeted for laptops and tablets. See Broadwell. Core i Series (i3, i5, i7) The i7, the first model of the i series was launched in 2008, which was the high end of the line. The less-powerful i5 and i3 models were introduced in 2009 and 2010, respectively. The original microarchitecture of the Core i series was code-named Nehalem. Subsequent microarchitectures were Sandy Bridge, Ivy Bridge, Haswell, etc. (see Intel microarchitectures). See Core i3, Core i5 and Core i7. Core 2 Prior to the Core i series, the 64-bit Core 2 family, introduced in mid-2006, was a major departure from the previous Core Duo chips. Using the Penryn microarchitecture, Core 2 chips became available in single, dual and quad core models. See Core 2. Core Duo 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. Used only in laptops, the Core Duo chips were superseded by the Core 2 family. See Core Duo.