This Apple Computer MA940G/A compatible 4GB (2x2GB) DDR2-667MHz DDR2-667MHz Dual Rank Unbuffered 1.8V 200-pin CL5 SODIMM is 100% guaranteed to be compatible with your system and to work right the first time. Adding additional memory is the best way to increase the performance of your system. All our memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. Our products are also guaranteed by federal law to not affect or void OEM warranties.

• 4 GB memory smoothly executes complex apps and games
• DDR2 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate
• 667 MHz of memory speed makes your computer great at multitasking