The HP EX950 was a solid-state drive in the M.2 2280 form factor, launched on January 9th, 2019, that is no longer in production. It was available in capacities ranging from 512 GB to 2 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the HP EX950 interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the SM2262ENG from Silicon Motion, a DRAM cache chip is available. HP has installed 64-layer TLC NAND flash on the EX950, 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. The cache is sized at 170 GB, once it is full, writes complete at 721 MB/s. The EX950 is rated for sequential read speeds of up to 3,500 MB/s and 2,900 MB/s write; random IO reaches 410K IOPS for read and 370K for writes.
At its launch, the SSD was priced at 153 USD. The warranty length is set to five years, which is an excellent warranty period. HP guarantees an endurance rating of 650 TBW, a typical value for consumer SSDs.