Axiom 4GB DDR3-1600 SODIMM for Apple # MB1600/4G-AX - 4 GB (1 x 4 GB) - DDR3 SDRAM - 1600 MHz DDR3-1600/PC3-12800 - Non-ECC - Unbuffered - 204-pin - SoDIMM

No matter how heavy and numerous the applications that you are using, 1600 MHz memory speed will run them smoothly SoDIMM 4 GB memory smoothly executes complex apps and games DDR3-1600/PC3-12800 operates at an effective bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation