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 256 GB 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 absorbed more quickly. 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 4,000 MB/s and 2,000 MB/s write; random IO reaches 270K IOPS for read and 470K for writes.
The SSD's price at launch is unknown. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 200 TBW, a typical value for consumer SSDs.