Apple did not formally announce the memory bandwidth with the M1, but claims the M1 Max is "just about 6x the memory bandwidth of M1." This, in idea, puts the M1 at around 66GB/s of peak memory bandwidth. Intel Beforehand explained that its new higher-end Main i9 processor is faster https://jaredsrnkg.ziblogs.com/28220926/what-does-ajm1max-mean