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The Core 2 brand refers to a range of Intel's consumer 64-bit single- and dual-core and 2x2 MCM (Multi-Chip Module) quad-core CPUs with the x86-64 instruction set, based on the Intel Core microarchitecture, derived from the 32-bit dual-core Yonah laptop processor. (Note: The Yonah's silicon chip or die comprised two interconnected cores, each similar to those branded Pentium M). The 2x2 MCM dual-die quad-core[1] CPU had two separate dual-core dies (CPUs)—next to each other—in one quad-core MCM package. The Core 2 relegated the Pentium brand to a mid-end market, and reunified laptop and desktop CPU lines, which previously had been divided into the Pentium 4, D, and M brands.