Knights featured AVX512F and were best at heavily SIMD workloads. Sierra Forrest is bad at these jobs of workloads, lacking AVX512 and having only 16 byte exec

Knights featured AVX512F and were best at heavily SIMD workloads. Sierra Forrest is bad at these jobs of workloads, lacking AVX512 and having only 16 byte execution units, so their AVX(2) throughput is also poor. They're thus going after a very different market.