The Western Digital RED SN700 is a solid-state drive in the M.2 2280 form factor, launched on September 28th, 2021. It is available in capacities ranging from 250 GB to 4 TB. This page reports specifications for the 4 TB variant. With the rest of the system, the Western Digital RED SN700 interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the 20-82-00700-A2 Triton MP28 from WD, a DRAM cache chip is available. Western Digital has installed 96-layer TLC NAND flash on the RED SN700, 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 66 GB, once it is full, writes complete at 1700 MB/s. The RED SN700 is rated for sequential read speeds of up to 3,430 MB/s and 3,100 MB/s write; random IOPS reach up to 550K for reads and 520K for writes.
At its launch, the SSD was priced at 650 USD. The warranty length is set to five years, which is an excellent warranty period. Western Digital guarantees an endurance rating of 5100 TBW, a good value.