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 512 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 processed more quickly. 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 3,500 MB/s and 2,500 MB/s write; random IOPS reach up to 430K for reads and 400K for writes.
The SSD's price at launch is unknown. The TBW rating for the Samsung PM9B1 512 GB is unknown, too.