The Platinum P31 will be one of the first consumer SSDs with 128-layer 4D NAND flash to offer sequential read and write rates of 3500 MB/s and 3200 MB/s, respectively.
https://www.notebookcheck.net/SK-Hynix-Gold-P31-and-Platinum-P31-PCIe-NVMe-SSDs-coming-with-128-layer-4D-NAND-flash.449013.0.html
It is still TLC flash. Which marketing idiot came up with "4D" NAND?