https://www.techpowerup.com/245874/s...eration-v-nand

Samsung Electronics, the world leader in advanced memory technology, today announced that it has begun mass producing its fifth-generation V-NAND memory chips with the fastest data transfers now available. In the industry's first use of the 'Toggle DDR 4.0' interface, the speed for transmitting data between storage and memory over Samsung's new 256-gigabit (Gb) V-NAND has reached 1.4-gigabits per second (Gbps), a 40-percent increase from its 64-layer predecessor.

The energy efficiency of Samsung's new V-NAND remains comparable to that of the 64-layer chip, primarily because the operating voltage has been reduced from 1.8 volts to 1.2 volts. The new V-NAND also has the fastest data write speed to date at 500-microseconds (μs), which represents about a 30-percent improvement over the write speed of the previous generation, while the response time to read-signals has been significantly reduced to 50μs.