This Intel 2 Core brand is derived from the 32 Bit dual core laptop processor. The 2x2 dual die quad core CPU had two separate dual core dies next to each other in one quad core package. The core micro architecture returned to lower clock rate and improved processors usage of both available clock cycles and power compared with preceding Net Burst of the Pentium 4-d branded CPU. The core 2 brand was introduced on July 27, 2006 comprising the Solo single core, duo Dual core, Quad quad core and Extreme Dual or Quad-core C