G.Skill FA-10666CL9S-4GBSQ For Apple Series SO-DIMM DDR3 RAM G.Skill 4GB (1x4GB) Single 1333Mhz CL9 1.5V

Brand - G.Skill, Size - 4GB (1x4GB), Channel - Single, Speed - 1333Mhz, Latency - CL9, Voltage - 1.5V, Timing - 9-9-9-24