Pentium

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Pentium is a registered trademark that is included in the brand names of many of Intel's x86-compatible microprocessors, both single- and multi-core.[1] The name Pentium was derived from the Greek pente (πέντε), meaning 'five', and the Latin ending -ium, a name selected after courts had disallowed trademarking of number-based names like "i586" or "80586" (model numbers cannot always be trademarked[2]). Following Intel's previous series of 8086, 80186, 80286, 80386, and 80486 microprocessors, Intel's fifth-generation microarchitecture, the P5, was first released under the Pentium brand on March 22, 1993. In 1995, Intel started to employ the registered Pentium trademark also for x86 microprocessors with radically different microarchitectures (e.g., Pentium Pro, II, III, 4, D, M, etc.). In 2006, the Pentium brand briefly disappeared from Intel's roadmaps,[3][4] only to re-emerge in 2007.[5]

In 1998, Intel introduced the Celeron[6] brand for low-priced microprocessors. With the 2006 introduction of the "upper" Core 2 brand, there was no plan to use the Pentium trademark anymore, but Intel developed a line of mid-range dual-core microprocessors under the Pentium Dual-Core name at the request of laptop manufacturers.[7] The Pentium brand thus lost its "upper" position and was repositioned between the Core 2 and Celeron Dual-Core lines as of 2007.[8][9]

In 2009, the "Dual-Core" suffix was dropped, and new x86 microprocessors started carrying the plain Pentium name again.

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