Micron has announced that it has commenced mass production of the industry's highest capacity monolithic 12 Gb LPDDR4x DRAM for mobile devices. The latest LPDDR4x chips aim to offer double the memory capacity while consuming lesser power and still retaining the same footprint as the previous generation.
https://www.notebookcheck.net/Micron-starts-mass-producing-12-Gb-LPDDR4x-DRAM-chips.358196.0.html