Unified memory using high bandwidth buses to support both GPU and CPU and the rest. I believe Apple uses very specific LPDDR5 packages then the pro and max hav

Unified memory using high bandwidth buses to support both GPU and CPU and the rest. I believe Apple uses very specific LPDDR5 packages then the pro and max have 2x and 4x buses so you need that many packages. This is why the M1 comes in 8GB ad 16GB, M1 Pro 16GB and 32GB and the Max is 32GB and 64GB. The current M2 is 8, 16 and 24GB, so naturally a top spec M2 Max would have 4x 24GB so you get 96GB assuming they stick with a 512 bit bus.