The switch to 20nm NAND flash memory should lead to lower cost drives.
OCZ announced a new 20nm NAND flash version of its popular Vertex 3 solid state drive (SSD) Series dubbed Vertex 3.20. Like the original, the Vertex 3.20 Series features a 6Gbps interface, multi-level cell (MLC) memory, and the same LSI SandForce SF-2200 controller. Performance specs are similar too, so why the switch? It all boils down to money, and in this case, 20nm has had time to mature and drop in price.