Although chips including Intel's Pentium 4 series could be overclocked ... The AMD FX-4170 was the first consumer desktop CPU to reach 4 GHz out of the box without any need for overclocking.

All Pentium 4 chips are single core, while dual-core Pentium models such as Pentium D and Pentium Processor Extreme Editions omit the "4" designation. See Pentium. Available in both 32-bit and 64 ...

The Pentium 4 processor 3.6F with EM64T was ... which is now expected next year. Desktop versions of Linux already support Intel's 64bit PC chips as well as AMD's Opteron and Athlon 64 processors.