Agreed. The short answer is Apple's using a SoC with LPDDR4x (thanks jeffbee) inside the package, and they are already using the highest density memory chips (

Agreed. The short answer is Apple's using a SoC with LPDDR4x (thanks jeffbee) inside the package, and they are already using the highest density memory chips (available when the M1 started shipping). This helps save power, increase bandwidth, decreases latency, and allows for more channels (2 channels per DDR5 chip). Not sure if Apple's going to just switch to a higher density chip (when they become available), add more memory channels, or maybe just make all the higher end iMac, mac pro, and similar machines dual socket which would double the max ram. Maybe even both, double the density and double the sockets. Clearly the heat/power/space for the M1 is substantially lower than the intel chips they replaced.