Samsung is refreshing its mid-range NVMe SSD lineup with the 970 Evo and Pro models that are using the latest version of the company's 64-layer 3D V-NAND memory chips. The Pro version is slightly faster but comes only in 512 GB and 1 TB capacities, while the Evo model has capacities ranging from 256 GB up to 2 TB.
https://www.notebookcheck.net/Samsung-launches-970-Evo-Pro-NVMe-M-2-SSDs.301162.0.html