200+ Gb/sec (IIRC Anandtech measured 240 Gb/sec) per a cluster.
Pro is one cluster, Max is two clusters and Ultra is four clusters, so the accumulative bandwidth is 200, 400 and 800 Gb/sec respectively[*].
The bandwidth is also shared with GPU and NPU cores within the same cluster, so on combined loads it is plausible that the memory bus may become fully saturated.
[*] Starting with M3, Apple has pivoted Pro models into more Pro and less Pro versions that have differing memory bus widths.
200+ Gb/sec (IIRC Anandtech measured 240 Gb/sec) per a cluster.
Pro is one cluster, Max is two clusters and Ultra is four clusters, so the accumulative bandwidth is 200, 400 and 800 Gb/sec respectively[*].
The bandwidth is also shared with GPU and NPU cores within the same cluster, so on combined loads it is plausible that the memory bus may become fully saturated.
[*] Starting with M3, Apple has pivoted Pro models into more Pro and less Pro versions that have differing memory bus widths.