G.Skill 4GB 2400MHz DDR4 SO-DIMM Laptop Memory Module (CL16) 1.20V PC4-19200 Ripjaws DDR4 Series Single 4GB DDR4 memory upgrade for laptop computers 2400MHz memory speed, PC4-19200 standard Full memory timings of CL16 (16-16-16-39) - 260 pins Requires voltage of only 1.20V which means longer battery life Features Auto-Overclocking which allows qualified systems to detect the highest available speed and automatically adjust BIOS settings to match