I would be interested to see the scaling path for 3D XPoint.
The trouble with this version of 3D (as opposed to 3D-NAND) is that adding more layers adds more cost proportionally, so cost/bit saturates. The mature, higher-voltage underlying CMOS should be relatively cheap.
As I understand it is already at the same design rule as DRAM (and in fact NAND) ~20 nm. Whether it can scale lower, could depend on what factors could disturb the cells, e.g., thermal. Also the lines connecting the cells get more resistive, which hinders the reading.
MLC/TLC would be the best or most practical hope. But this requires a mature enough (resistive) memory, and this would also slow down the writing.
The retention is the key for any power savings to be realized. But it is not highlighted, which has me worried for this release..
Not trying to be personal, but I'm reading a lot negative, imo short sighted comments. Intel has spent probably a ton of money developing this technology, and have yet to see any revenue, so of course the initial costs will be high with low volumes. But of course the costs will fall nicely as this technology matures and the volume goes up with the economies of scale benefits.
Secondly, DRAM progress has basically come to a stand still, while Intel already has 3 generation of 3DXP in the pipline. They can achieve higher bit density and thus cost with three vectors: smalles geometries (and associated scaling beneifts like possibly performance, latency and endurance), more layers (now 2, although not as scalable as 3D NAND), and more bits per cell.
So this technology has a lot of long-term potential. Of course one shouldn't expect a revolution overnight, but this technology is really promising certainly given the general trends in high-performance computing we're seeing.
No overprovisioning yet the drive uses 448GB (28x16) but only 375GB usable...
The pricing is not reasonable nor expected. Last year DRAM was 3$/GB and Xpoint was supposed to be substantially cheaper not 4$/GB. Likely they don't have the production capacity to sell much this year so we'll see where things settle in 2018-2019.