Intel has been hard at work with anything Optane in the form of storage units and cache drives. A long time ago Intel already indicated Optane memory, well they have now shown modules based on 3D XPoint technology in sizes of 128, 256 and 512 GB.

These sticks fit into DDR4 slots in servers, promising better performance due to the “stacked” nature of 3D XPoint technology. This is non-volatile memory, so this type of memory holds onto data when devices are shut down (whereas volatile memory doesn’t). Non-volatile memory is typically used in solid-state drives and USB sticks (NAND) whereas volatile memory is typically used in system memory sticks (DRAM). However, Intel is using its 3D XPoint technology in SSD and memory stick (DIMM) form factors.

Intel’s Optane memory is non-volatile/retains data, unlike volatile DRAMs. So one cannot completely replace DRAMs ignoring their need in a PC. So if the modules can be combined with normal DRAM on the same memory channel is unclear, Intel has not talked about that. 

The modules are supported by the next generation of the Xeon platform. Currently, potential customers can try out the technology and the first customers will receive the modules later this year. In 2019, the Intel Optane DC Persistent Memory modules would be widely available. With Optane memory DIMMs available it is thought servers will be able to "greatly expand" the high performance hot storage capacity available. Ahead of this Optane tech SSDs are already arriving to perk up the 'warm storage' performance available.