of the lower operating voltage of DDR4 chips (1.2 V) compared with the operating voltage of DDR3 chips (1.5 V for regular DDR3 and 1.35 V for low-voltage DDR3L), UniDIMMs are designed to contain additional built-in voltage regulation circuitry.

The UniDIMM specification was created to ease the market transition from DDR3 to DDR4 SDRAM. In previous RAM standard transitions, as it was the case when DDR2