The Western Digital SN740 is a solid-state drive in the M.2 2230 form factor, launched on May 9th, 2022. It is available in capacities ranging from 256 GB to 2 TB. This page reports specifications for the 2 TB variant. With the rest of the system, the Western Digital SN740 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the 20-82-10081-A1 Polaris MP16+ from WD, a DRAM cache is not available. Western Digital has installed 112-layer TLC NAND flash on the SN740, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are soaked up more quickly. The cache is sized at 160 GB. Copying data out of the SLC cache (folding) completes at 400 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The SN740 is rated for sequential read speeds of up to 5,150 MB/s and 4,850 MB/s write; random IOPS reach up to 650K for reads and 800K for writes.
At its launch, the SSD was priced at 300 USD. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 500 TBW, a relatively low value compared to other SSDs.