There's a third memory standard, called Hybrid Memory Cube (HMC), which is backed by Micron and is designed for high-performance computing. It was developed by an industry group called Hybrid Memory Cube Consortium. Intel has implemented a new form of 3D memory in its Xeon Phi X200 supercomputing chip -- code-named Knights Landing -- which could be based on HMC. Intel expressed support for HMC as far back as 2011, but has declined to confirm using the memory type in Xeon Phi.
It's yet to be seen how adoption of the new memory standards will shake out, but in any case users will ending up benefiting from better GPU and system performance.
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