Comment by eigenspace

The memory does *not* live on the same chip as the CPU and GPU, you appear to be thinking of HBM. Apple is using regular LPDDR5 RAM on separate chips, but soldered near to the CPU/GPU.

The soldering does serve a purpose though, the shorter traces allow for better signal integrity at higher speeds. This isn't something special about what Apple is doing though, Intel and AMD are doing the exact same thing with the exact same LPDDR5 chips on their respective APUs.

HBM is still almost purely reserved for datacentre GPUs.