LPDDR never has ECC. Also, one can look at the [x-rays of the M1 die (https://images.anandtech.com/doci/16252/M1.png https://images.anandtech.com/doci/16252/M1.

LPDDR never has ECC. Also, one can look at the [x-rays of the M1 die (https://images.anandtech.com/doci/16252/M1.png https://images.anandtech.com/doci/16252/M1.png) and see the eight 16-bit LPDDR channels. It might have ECC on caches but that's nothing exciting.