Axiom 4GB DDR3-1333 SODIMM for Apple # MB1333/4G-AX - 4 GB (1 x 4 GB) - DDR3 SDRAM - 1333 MHz DDR3-1333/PC3-10600 - Non-ECC - Unbuffered - 204-pin - SoDIMM

Up to 1333 MHz speed for playing the latest games and using heavy software SoDIMM 4 GB memory smoothly executes complex apps and games DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate