The Extreme Edition brand was introduced in 2003 and was extended to Intel's dual core models, but the "4" was dropped to differentiate them from the single-core chips (see Pentium Processor ...
Intel's top Pentium chip, introduced in late 2000. The successor to the Pentium III, the Pentium 4 features the NetBurst micro-architecture (see NetBurst). All Pentium 4 chips are single core ...