At Samsung's Tech Day event today in San Jose, the company shared their SSD roadmap for transitioning to 96-layer 3D NAND and introducing four bit per cell (QLC) NAND flash memory. Successors have been named for most of their current SSDs that use three bit per cell (TLC) NAND flash and are being updated with 96-layer 3D TLC, and new product lines using QLC NAND have been introduced.

Taking TLC to new heights Most of the updates to the TLC-based SSDs are fairly straightforward NAND upgrades that use existing SSD controllers. The PM981 client NVMe SSD and the 970 EVO retail counterpart that use 64-layer 3D TLC will be succeeded by the PM981a and 970 EVO Plus respectively. Capacity options remain the same, ranging from 250GB to 2TB. The most significant performance improvements are to sequential write speeds, but the PM981a also brings significant random I/O improvements that almost catch it up to the 970 EVO and 970 EVO Plus. The PM983 datacenter SSD that uses the same Samsung Phoenix controller as the above client/consumer drives is being replaced by the PM983a. This update brings a doubling of capacities, now allowing for up to 16TB (presumably only on NF1 and U.2 form factors). In the datacenter, SLC write caches are not used so the advertised write speeds are significantly lower than for the client/consumer drives, but there are still significant improvements here.

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The PM971a client NVMe BGA SSD is getting a significant update in the new PM991 that roughly doubles random I/O and sequential write performance and improves sequential reads by about 50%. The enterprise SAS product line is not seeing any major changes to performance or available capacities, but the update from the PM1643 to the PM1643a does improve random write performance by about 20%. Virtual studio set software free download. The largest model remains 30.72TB. The high-end enterprise NVMe drives are getting a major controller update that brings PCIe 4.0 support in addition to the NAND upgrade. This allows for much higher performance across the board, most notably with sequential read speeds reaching 8GB/s on the new PM1733 compared to 3.5GB/s on the PM1723b. The maximum available capacity has caught up to the SAS product line with the introduction of a 30.72TB model.

The PM1733 also introduces dual-port PCIe capability to this product line, providing a migration path for SAS SSD users who require this reliability feature. Rolling out QLC Samsung's naming scheme for enterprise and OEM SSDs uses model names starting with SM for drives with MLC NAND, PM for TLC NAND, and now BM for QLC NAND. Four new QLC SSDs have been announced: the BM1733 and BM9A3 enterprise NVMe SSDs, the BM1653 enterprise SAS SSD, and the BM991 client NVMe SSD. All of these have obvious parallels with TLC-based PM-series models above, but Samsung has not yet shared detailed specifications for any of these QLC drives. Samsung also mentioned the 860 QVO SATA and 980 QVO NVMe client drives.