Yeah, nearly 30 years of continual incremental improvements to the same P6 microarchitecture. Intel actually went back to the P6 µarch after Netburst (Pentium

Yeah, nearly 30 years of continual incremental improvements to the same P6 microarchitecture. Intel actually went back to the P6 µarch after Netburst (Pentium 4) failed to meet expectations. Fortunately, they had continue to improve P6 as a laptop focused processor (Pentium M). Netburst is a very interesting µarch, with a lot of interesting innovations. Some of those ideas (like hyperthreadding, the single physical register file and a simplified uop cache) eventually made their way back to the P6 uarch. And it's not just historically relevant to Intel. Other CPU vendors started copying the basic layout of the P6 and as now days the high-level views of AMD's Zen µarch and all high-performance AArch64 µarches look remarkably similar to the P6 and its decedents.