The Transcend 250H is a solid-state drive in the M.2 2280 form factor, launched in February 2023. It is available in capacities ranging from 1 TB to 4 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the Transcend 250H interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the SM2264F from Silicon Motion, a DRAM cache chip is available. Transcend has installed 112-layer TLC NAND flash on the 250H, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. The cache is sized at 100 GB, once it is full, writes complete at 788 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The 250H is rated for sequential read speeds of up to 7,200 MB/s and 6,200 MB/s write; random IO reaches 530K IOPS for read and 420K for writes.
At its launch, the SSD was priced at 95 USD. The warranty length is set to five years, which is an excellent warranty period. Transcend guarantees an endurance rating of 780 TBW, a typical value for consumer SSDs.