Apple didn't formally announce the memory bandwidth with the M1, but suggests the M1 Max is "approximately 6x the memory bandwidth of M1." This, in idea, places the M1 at all around 66GB/s of peak memory bandwidth. There is no Boot Camp for Macs with Apple silicon chips, as well https://trentonyxuts.dreamyblogs.com/28504313/ajmslot-an-overview