G.Skill 8GB Ripjaws DDR3 2133MHz SO-DIMM laptop memory dual channel kit (2x 4GB) CL11-1.35V 8GB G.Skill Ripjaws DDR3 Laptop upgrade kit Consists of 2x 4GB single modules, 204 pins 2133MHz PC3-17000 SO-DIMM Timings of CL11 (11-11-11-36) at 1.35V Low-voltage 1.35V memory kit