The first CPU to reach a clock speed of 4 GHz was the Pentium 4 570 released in November 2004 as part of Intel's NetBurst microarchitecture, but this milestone wasn't achieved out of the box.

The Apple II ran at 1 MHz, the first IBM PC ran at ... the more power it generates. As processors developed, they ran ahead ...

Intrinsity to Target Wireless and Wired Infrastructure Markets with High-Performance, Multi-Gigahertz Processor MOUNTAIN VIEW, Calif., April 22, 2002 -- MIPS Technologies, Inc. (Nasdaq: MIPS, MIPSB), ...