The Samsung 840 Pro was a solid-state drive in the 2.5" form factor, launched in October 2012, that is no longer in production. It was available in capacities ranging from 128 GB to 512 GB. This page reports specifications for the 256 GB variant. With the rest of the system, the Samsung 840 Pro interfaces using a SATA 6 Gbps connection. The SSD controller is the MDX (S4LN021X01) from Samsung, a DRAM cache chip is available. Samsung has installed MLC NAND flash on the 840 Pro, the flash chips are made by Samsung. The 840 Pro is rated for sequential read speeds of up to 530 MB/s and 520 MB/s write; random IOPS reach up to 90K for reads and 100K for writes.
At its launch, the SSD was priced at 270 USD. The warranty length is set to five years, which is an excellent warranty period. Samsung guarantees an endurance rating of 73 TBW, a relatively low value compared to other SSDs.