Since Intel and Micron announced 3D XPoint storage in 2015, the world has been waiting for companies to use it  3D XPoint mixes the characteristics of flash memory and DRAM memory. Like Flash, it is stable and retains its value even when the systems are shut down, and it is dense, with about ten times the DRAM density. Like DRAM, it supports random access with low latency. Intel also claimed that its write-resistance is much better than Flash's. This combination of features has resulted in memory sticks that look like DIMMs and appear to the system like DDR4 RAM, but with much greater capacity and consistency: data written in "RAM" will be preserved over time. Memory with these features is of interest to a wide range of applications ̵
Not anymore. Today, Intel has announced Intel Optane DC Persistent Memory. This is a series of DDR4 memory sticks (with capacities of 128 GB, 256 GB and 512 GB) that use 3D XPoint instead of conventional DRAM cells. Result? The latency is a bit worse than real DDR 4, but they are persistent. Although they use the standard DDR4 form factor, they are only supported on Intel's Next Generation Xeon platform.
Intel provides the new storage as a way to significantly increase the amount of memory available to processors and eliminate latency, usually when moving data from storage to persistent storage. This is important for a number of database and caching workloads. Persistence means that freshly started servers no longer need to load terabytes of data into memory – they actually exist. Because persistent storage has such a big impact on software developers, Intel will also have a scheme that allows developers (under NDA) remote access to Optane Persistent Memory machines so they can develop and test software that uses their persistent capabilities. 19659004] Beyond this basic information, we still do not know much about Optane DC Persistent Memory: performance, endurance, power consumption, system / processor compatibility, all are unknown until now. Intel is also vague about the availability of the product: high availability will take place sometime in 2019, but selected customers will be able to get hold of it this year.