G.Skill FA-5300CL5D-4GBSQ For Apple Series SO-DIMM DDR2 RAM G.Skill 4GB (2x2GB) Dual 667Mhz CL5 1.8V

Brand - G.Skill, Size - 4GB (2x2GB), Channel - Dual, Speed - 667Mhz, Latency - CL5, Voltage - 1.8V, Timing - 5-5-5-15