Apple did not formally announce the memory bandwidth in the M1, but claims the M1 Max is "just about 6x the memory bandwidth of M1." This, in idea, places the M1 at around 66GB/s of peak memory bandwidth. The M1 Max will be the most powerful bit of bespoke silicon https://damienvwvtt.bligblogging.com/28684495/not-known-facts-about-ajm-slot