The MSI Spatium M461 is a solid-state drive in the M.2 2280 form factor, launched on December 22nd, 2022. It is available in capacities ranging from 500 GB to 4 TB. This page reports specifications for the 4 TB variant. With the rest of the system, the MSI Spatium M461 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the PS5021-E21T from Phison, a DRAM cache is not available. MSI has installed 176-layer QLC NAND flash on the Spatium M461, the flash chips are made by Micron. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are handled more quickly. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The Spatium M461 is rated for sequential read speeds of up to 5,000 MB/s and 4,200 MB/s write; random IO reaches 600K IOPS for read and 850K for writes.
At its launch, the SSD was priced at 179 USD. The warranty length is set to five years, which is an excellent warranty period. MSI guarantees an endurance rating of 900 TBW, a relatively low value compared to other SSDs.