Crucial 8GB (2x 4GB) CL11 DDR3L-1600 PC3L-12800 1.35V / 1.5V DR x8 204-pin SODIMM RAM Kit for Mac (or PC)Product Overview This 8GB (2x 4GB) DDR3L 1600 MT s Dual rank, x8 configuration RAM kit for Mac (or PC) from Crucial is for use in DDR3L compatible systems and operates at 1600 MT s with an overall transfer rate of PC3L 12800. This RAM kit also operates at a standard voltage of 1. 35V 1. 5V with a CAS Latency of CL11, and is designed to allow you to run more applications simultaneously, switch between them faster, and provide a smoother computing