By employing technologies like TSV and HKHG, Samsung is now able to up the DDR5 module capacity to 512 GB. These modules are designed for data centers and are twice as fast as any current DDR4 solutions. Desktop versions with more "down to earth" capacities should also be available towards the end of the year.
https://www.notebookcheck.net/Samsung-announces-industry-s-first-512-GB-DDR5-module.529227.0.html