PC processors entered the Gigahertz era today in the year 2000 with AMD's Athlon https://www.tomshardware.com/pc-components/cpus/pc-processors-entered-the-gigahertz-era-today-in-the-year-2000-with-amds-athlon-amd-hit-marketing-gold-with-its-1-ghz-athlon-beat-intel-by-a-nose