A Walk Through SK Hynix at CES 2020: 4D NAND SSDs and DDR5 RDIMMs
Korean DRAM and NAND flash giant SK Hynix brought its latest memory innovations to the 2020 International CES. The star attraction at their booth was the "4D NAND" technology, and some of the first client-segment SSDs based on it. As a concept, 4D NAND surfaced way back in August 2018, and no, it doesn't involve the 4th dimension. Traditional 3D NAND chips use charge-trap flash (CTF) stacks spatially located next to a peripheral block that's responsible for wiring out all of those CTF stacks. In 4D NAND, the peripheral block is stacked along with the CTF stack itself, conserving real-estate on the 2-D plane (which can then be spent on increasing density). We caught two 128-layer 4D NAND-based client-segment drives inbound for 2020, the Platinum P31 M.2 NVMe, and Gold P31 M.2 NVMe. The already launched Gold S31 SATA drive was also there.