Corsair CMSA32GX3M4C1866C11 Mac Memory 32GB DDR3L 1866 C11 1.35V/1.5V SODIMM 1.35V Density: 32GB (4x8GB) Speed: 1866MHz Timing: 11-11-11-32 Voltage: 1.35V / Type: DDR3L Format: SO-DIMM Memory Type: DDR3L