Dueling Dual-Core Systems: Overclocking Goes Mainstream
 

Last year, Intel admitted that shipping 4GHz processors would be more difficult than it previously believed. The current top-of-the-line Pentium 4 Extreme Edition maxes out at 3.73GHz; the Pentium 4 model 570J ships at 3.80GHz. The recent dual-core Pentium Extreme Edition 840 is shipping at 3.2GHz. Apparently, Intel has unlocked the multiplier on the Pentium Extreme Edition 840 dual-core CPU, similar to the way AMD ships the FX series processors unlocked.

http://www.extremetech.com/article2/...88913%2C00.asp