Larger (higher capacity) HBM2 stacks do not yet exist and the manufacturing process is pretty complicated/expensive. It's worth noting that all the stacks end

Larger (higher capacity) HBM2 stacks do not yet exist and the manufacturing process is pretty complicated/expensive. It's worth noting that all the stacks end up on the same piece of silicon as the GPU itself. Don't assume that they are holding back tech due to lack of competition. 650 GB/s is pretty impressive.