But as time passed, more and more online news of Pentium4 processors easily overcoming the 3 GHz boundary at the nominal voltage were emerging. With the Vcore increased, the processors were able running at speeds ~3.5GHz, and some specimen were even able getting over the 4 MHz boundary.
In fact, there is nothing of a surprise in that. Already in summer last year Intel started migration of its production lines towards the manufacture of processors featuring stepping C1. The major difference of stepping C1 from the previous B0 lies in the ability to run at much higher speeds as well as in some slight changes in the core.
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