The Samsung 950 PRO was a solid-state drive in the M.2 2280 form factor, launched in October 2015, that is no longer in production. It was available in capacities ranging from 256 GB to 512 GB. This page reports specifications for the 256 GB variant. With the rest of the system, the Samsung 950 PRO interfaces using a PCI-Express 3.0 x4 connection. The SSD controller is the UBX (S4LN058A01-8030) from Samsung, a DRAM cache chip is available. Samsung has installed 32-layer MLC NAND flash on the 950 PRO, the flash chips are made by Samsung. The 950 PRO is rated for sequential read speeds of up to 2,200 MB/s and 900 MB/s write; random IOPS reach up to 270K for reads and 85K for writes.
At its launch, the SSD was priced at 200 USD. The warranty length is set to five years, which is an excellent warranty period. Samsung guarantees an endurance rating of 200 TBW, a typical value for consumer SSDs.