It can be kind of hard to keep track of the tangle of emerging computer memory technologies with one seemingly announced every other week, from Intel's highly publicized but still mysterious 3D XPoint technology to organic ferroelectrics. The memory holy grail, however, is to reduce it all, the entire hierarchy of computer memory, to one single level. This is the universal memory dream.

Researchers at IBM announced this week at the IEEE International Memory Workshop in Paris—and in an accompanying paper—the successful storage of three bits of data per cell within a 64,000 cell phase-change memory (PCM) array. The bits were able to survive both high temperatures and up to one million endurance cycles, prerequisites for real-world utility.

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