The Samsung PM9A1 is a solid-state drive in the M.2 2280 form factor, launched on September 22nd, 2020. It is available in capacities ranging from 256 GB to 2 TB. This page reports specifications for the 512 GB variant. With the rest of the system, the Samsung PM9A1 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the Elpis (S4LV003) from Samsung, a DRAM cache chip is available. Samsung has installed 128-layer TLC NAND flash on the PM9A1, 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. The cache is sized at 94 GB, once it is full, writes complete at 1000 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The PM9A1 is rated for sequential read speeds of up to 6,900 MB/s and 5,000 MB/s write; random IOPS reach up to 800K for reads and 800K for writes.