2年前のニュースなので、optaneが発売される前となり今とは違うはずだが、6TBメモリー（NVDIMM）の実装例

http://www.tomshardware.com/news/intel-3d-xpoint-picture-nvdimm,30890.html

The 3D XPoint NVDIMM utilizes the DDR4 interface to communicate directly with
the CPU. Intel stated today that the current maximum capacity per 3D XPoint
NVDIMM is 512 GB, and dual-socket servers can address up to 6 TB total with
two CPUs. The largest DDR4 modules weigh in at a mere 128 GB apiece. To put
the 6 TB per-server density server into perspective: Windows Server 2012 R2
supports only 4 TB of memory.

Microsoft also detailed its role for enabling NVDIMM functionality, and thus 3D
XPoint, in a panel today. Microsoft has an in-house build of Server 2016 with a
new file system designed specifically to address new ultra-low latency NVDIMM
devices. NVDIMMs are a range of Storage Class Memory (SCM) products that
utilize the memory bus and DRAM, NAND, and now 3D XPoint to provide ultra-fast
storage performance.