Doesn't this have to do with the DDR3 standard which mostly maxed out at 8GB per slot and Intel mobile CPUs with 4 RAM slots max? DDR4 bumps it up to 32GB per

Doesn't this have to do with the DDR3 standard which mostly maxed out at 8GB per slot and Intel mobile CPUs with 4 RAM slots max? DDR4 bumps it up to 32GB per slot IIRC, so DDR4 maxes out at 128GB, assuming 4 max slot is still intact for Intel mobile CPUs. I haven't seen any reports that the Intel mobile Xeon would go further than 4 slots.