4GB [2x2GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for the Apple MacBook 13.3" 2.13GHz Core 2 Duo 5,2 MC240LL/A (Genuine A-Tech Brand) 4GB [2x2GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for the Apple MacBook 13.3" 2.13GHz Core 2 Duo 5,2 MC240LL/A 100% Genuine A-Tech Brand Memory 2GB DDR2-800 PC2-6400 Non-ECC Unbuffered 200 Pin 1.8V CL=6 Memory Limited Lifetime Warranty High Quality Ram specifically designed for the Apple MacBook 13.3" 2.13GHz Core 2 Duo 5,2 MC240LL/A