LPDDR4X (Low Power DDR4 Extreme)

LPDDR4X is the extended-voltage version of LPDDR4, reducing I/O voltage from 0.8 V to 0.6 V while maintaining speeds up to 4266 MT/s, yielding approximately 20% lower power consumption. Found in older-generation thin-and-light laptops (Surface Laptop 4, 2021 Intel MacBook Pro), ARM Chromebooks, and embedded systems. Still used in mid-range thin-and-light designs where LPDDR5X is cost-prohibitive or where the SoC does not yet support LPDDR5.