Intel's 925XE: Does Beating the 1-GHz FSB Barrier Matter?
 

The whole industry is on the edge of its seat waiting for several new products from the House of Intel. One example is the family of Pentium 4 processors with Enhanced Speedstep, designed to lower average power loss. Then there's the 925XE chipset waiting in the wings, whose faster system bus speed is destined to really get the LGA775 platform rocking.

http://www20.tomshardware.com/cpu/20041012/index.html

As the clock increases envisioned by the Intel roadmap were further deferred into the future in the middle of this year, we do not expect the emergence of 4 GHz processors in 2004.