The PM971-NVMe offers up to 512 GB of storage space and is the industry's first SSD with this capacity that comes as a single BGA package and targets "next-generation PCs and ultra-slim notebook PCs."
http://www.notebookcheck.net/Samsung-starts-mass-production-of-the-industry-s-first-512-GB-NVMe-SSD.166868.0.html