The Samsung PM9B1 is a solid-state drive in the M.2 2280 form factor, launched in 2022. It is available in capacities ranging from 256 GB to 512 GB. This page reports specifications for the 256 GB variant. With the rest of the system, the Samsung PM9B1 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the 88SS1322 Whistler Plus from Marvell, a DRAM cache is not available. Samsung has installed 128-layer TLC NAND flash on the PM9B1, the flash chips are made by Samsung. 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 22 GB, once it is full, writes complete at 250 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The PM9B1 is rated for sequential read speeds of up to 3,300 MB/s and 1,250 MB/s write; random IOPS reach up to 240K for reads and 400K for writes.
The SSD's price at launch is unknown. The TBW rating for the Samsung PM9B1 256 GB is unknown, too.