The bleeding edge of DRAM technology is now officially known as DDR5, rated for twice the data-transfer rates of its predecessor DDR4. However, its own next generation, DDR6, is now slated to launch with double these new speeds - or less than half those of DDR7 again. Both upcoming upgrades are said to be in the works at Samsung already.
https://www.notebookcheck.net/Preliminary-DDR7-specs-put-the-next-gen-RAM-s-top-speed-at-5-times-that-of-standard-DDR5.580580.0.html