SanDisk recently introduced the WD Blue SN5100 SSD， which serves as the successor to last year’s WD Blue SN5000. While the SN5100 maintains its PCIe 4.0 interface， SanDisk claims that its updated hardware delivers up to a 30% performance improvement over its predecessor. This upgrade positions the SN5100 as a compelling option for users seeking enhanced speed in their storage solutions.
The previous SN5000 utilized 112-layer BiCS5 TLC NAND (with the 4TB model featuring 162-layer BiCS6 QLC NAND). In contrast， the SN5100 exclusively employs QLC NAND， specifically Kioxia’s BiCS8 QLC NAND. This transition to QLC NAND across all capacities could be a strategic move by SanDisk to leverage cost efficiencies and potentially higher densities， although QLC typically presents a trade-off in endurance compared to TLC. However， SanDisk’s implementation of its latest nCache 4.0 technology aims to mitigate this by enabling high-speed writes to SLC cache blocks before asynchronously moving data to QLC storage during idle periods. This hybrid approach is designed to maintain excellent responsiveness for everyday tasks and demanding workloads.
The SN5100 adopts the popular M.2 2280 form factor with a single-sided design， making it compatible with a wide range of motherboards and notebooks. It will be offered in four capacities: 500GB， 1TB， 2TB， and 4TB， catering to various user needs and budgets.
In terms of performance， the 1TB and 2TB models of the SN5100 boast sequential read speeds of 7100 MB/s and sequential write speeds of 6700 MB/s. Other capacities may exhibit slightly lower performance figures due to differences in NAND configurations or controller limitations. Compared to the SN5000， the SN5100 represents a significant leap in sequential performance， with a reported 29% increase in sequential read speeds and a 34% increase in sequential write speeds. This improvement is likely attributed to the enhanced controller and the nCache 4.0 technology.
The random performance has also seen a notable boost. The SN5100 achieves up to 1 million IOPS for random reads and 1.3 million IOPS for random writes. This translates to a commendable 37% improvement in random read speeds and a 44% improvement in random write speeds when compared to the SN5000. Such gains are particularly beneficial for tasks involving small file operations， such as operating system boot times， application loading， and multitasking.
The endurance ratings for the SN5100 remain consistent with its predecessor. The 500GB model offers 300 TBW (Terabytes Written)， the 1TB model provides 600 TBW， the 2TB model comes with 900 TBW， and the 4TB model is rated at 1200 TBW. While these figures are respectable for mainstream consumer use， users with extremely high write-intensive workloads might consider higher-end NVMe SSDs with greater endurance.
Regarding pricing， the SN5100’s 500GB and 1TB models are priced at $54.99 and $79.99 respectively. These figures represent a notable increase of approximately 22% and 23% compared to the launch prices of the corresponding SN5000 models. Similarly， the 2TB and 4TB variants of the SN5100 are priced at $149.99 and $299.99. These represent price hikes of around 27% for the 2TB model and 36% for the 4TB model， relative to the SN5000. This price increase， coupled with the shift to QLC NAND， suggests that SanDisk is positioning the SN5100 as a premium PCIe 4.0 offering， justifying the higher cost with its enhanced performance metrics. Consumers will need to weigh the performance gains against the increased cost and the implications of QLC NAND for their specific usage scenarios.
