Samsung 850 Pro 3D NAND and RAM caching result in the fastest, most durable SSD money can buy

by JamesNYCSeptember 3. 2014 06:16

In the world of SSDs, the Samsung 850 Pro is a major achievement. Up until now, all of the advances in SSD technology have come from either shrinking the size of the memory cells through using smaller process nodes, or through packing more data into each cell. For years, that approach won us ever-falling prices and improved performance, but it came with a built-in timer — at each successively smaller process node, it became more and more difficult for manufacturers to ensure NAND would retain its speed and reliability for years.

The alternative to this approach is to adopt 3D NAND, also called V-NAND (Vertical NAND), and stand the entire die stack on its head. The 850 Pro is the first SSD to deploy this method. Samsung has worked on the technology for years. We’ve discussed 3D NAND multiple times before — the basic idea is that by standing the NAND stack on its head and working downwards, it’s possible to build a NAND structure that holds a great deal more data per square millimeter — or at least, that’s the eventual goal.

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