If you're comparing "narrow and deep" to "wide and shallow", neither won, really. Modern high-performance designs are basically "wide and deep" with lots of spe

If you're comparing "narrow and deep" to "wide and shallow", neither won, really. Modern high-performance designs are basically "wide and deep" with lots of speculation, better branch prediction, and various tricks to almost eliminate the need to flush the pipeline. Admittedly, none have quite the pipeline length of the P4, but Haswell's 14-19 stage pipeline definitely qualifies as "deep". Even ARM has gone deep - Cortex-A15 has a 15 stage integer pipeline, plus up to an additional 10 stages for some NEON/FPU instructions. If anything won, it was designing to the reality of silicon transistor frequency scaling for 90nm and smaller.