More bandwidth, and more or wider cache lines, maybe. From my crude benchmarking, pretty sure a lot of the oomph in Apple's M1 is that 128-byte cache line. 512

More bandwidth, and more or wider cache lines, maybe. From my crude benchmarking, pretty sure a lot of the oomph in Apple's M1 is that 128-byte cache line. 512-byte SIMD operations are great, but if I'm constantly having to copy things over to SIMD registers to do it... am I really winning? More cores just means more cache evictions / contention in many workloads.