CORSAIR 16GB (2 x 8GB) DDR3 1600 (PC3 12800) Memory for Apple Model CMSA16GX3M2A1600C11 Type: 204-Pin DDR3 SO-DIMM Compatibility: For Apple MacBook, MacBook Pro & iMac Cas Latency: 11 Timing: 11-11-11-30 Voltage: 1.35V Multi-channel Kit: Dual Channel kit