The HP EX900 was a solid-state drive in the M.2 2280 form factor, launched in 2018, that is no longer in production. It was available in capacities ranging from 120 GB to 500 GB. This page reports specifications for the 500 GB variant. With the rest of the system, the HP EX900 interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the SM2263XT from Silicon Motion, a DRAM cache is not available. HP has installed 64-layer TLC NAND flash on the EX900, the flash chips are made by Micron. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are processed more quickly. The cache is sized at 75 GB, once it is full, writes complete at 200 MB/s. The EX900 is rated for sequential read speeds of up to 2,100 MB/s and 1,500 MB/s write; random IOPS reach up to 120K for reads and 108K for writes.
At its launch, the SSD was priced at 180 USD. The warranty length is set to three years, which is above average, but shorter than the five years offered by many other vendors. HP guarantees an endurance rating of 200 TBW, a typical value for consumer SSDs.