The JESD79-4D document outlines several critical parameters for JEDEC-compliant DDR4 devices, ranging from in density.
A hallmark of this standard is the shift to a lower 1.2V operating voltage, a significant reduction from the 1.5V used in DDR3. This leads to reduced power consumption and less heat generation. jesd794d pdf
The full 270-page document is a comprehensive guide for engineers and manufacturers. Key sections typically include: JEDEC - JESD79-4D - DDR4 SDRAM - Standards | GlobalSpec jesd794d pdf