The Silicon Motion SM2508 Engineering Sample is a solid-state drive in the M.2 2280 form factor, launched on September 2nd, 2024. It is available in capacities ranging from 1 TB to 2 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the Silicon Motion SM2508 Engineering Sample interfaces using a PCI-Express 5.0 x4 connection. The SSD controller is the SM2508 from Silicon Motion, a DRAM cache chip is available. Silicon Motion has installed 162-layer TLC NAND flash on the SM2508 Engineering Sample, the flash chips are made by Kioxia. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. The cache is sized at 160 GB, once it is full, writes complete at 2800 MB/s. Thanks to support for the fast PCI-Express 5.0 interface, performance is excellent. The SM2508 Engineering Sample is rated for sequential read speeds of up to 14,000 MB/s and 13,000 MB/s write; random IO reaches 2000K IOPS for read and 2000K for writes.
The SSD's price at launch is unknown. The TBW rating for the Silicon Motion SM2508 Engineering Sample 1 TB is unknown, too.