Apple did not formally announce the memory bandwidth with the M1, but suggests the M1 Max is "approximately 6x the memory bandwidth of M1." This, in theory, puts the M1 at around 66GB/s of peak memory bandwidth. Benchmarks which have surfaced seem to concur that the additional cores as well https://emilianoedbzv.tokka-blog.com/28340770/a-review-of-ajmslot