* Shared bandwidth between CPU and GPU - as soon as you use up one, you're bottlenecking the other. * No M2 memory benchmark I've seen gets above ~250GB/s once

* Shared bandwidth between CPU and GPU - as soon as you use up one, you're bottlenecking the other. * No M2 memory benchmark I've seen gets above ~250GB/s once cache effects are exceeded. * Random access latency is >~110ns which is no improvement over even mid-range DDR4 designs from 5 years ago. TL;DR: It's about cost