Gregory's Server@kornel @stroughtonsmith and 21 years before the G5, the ZX Spectrum came out with a 3.5 MHz Z80, an 8-color display and either 16 or 48 kilobytes of RAM. I'd say Moore's Law dramatically slowed (especially for single-core performance) around the time the G5 came out.
@Alphacheez Moore’s law is about transistor count per cost. Nothing to do with clock speed, and only indirectly with performance. (That said, it _has_ slowed.)