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Phase-Change Memory



A type of memory that stores information in the amorphous and crystalline phases. It can be reversibly switched with an external voltage.

Phase-change memory (PCM) is considered a storage-class memory that fits between DRAM and NAND in the memory hierarchy. The most prominent memory in this class is 3D XPoint, developed by Intel and Micron, which is expected to be used in DIMMs for servers. Built around a two-layer stacked architecture, a 3D XPoint device comes in 128-gigabit densities using 20nm geometries. The read latency is about 125ns with 200K cycles of endurance.