PC2 5300S support DDR2 667MHZ laptop, PC2-5300 240-Pin SODIMM Unbuffered Non ECC, 1.8V CL5 2Rx8 Dual Rank. Please confirm the model number of your computer before purchasing. And determine the maximum capacity supported by your computer. Memory Size: 4GB (2x2GB)High-Quality and Strict Test: Adopt Samsung, Hynix, Micron chips. All chips 100% Tested, Ensure the quality of each ddr2 pc2-5300s ram.Multifunction: Increase bandwidth by up to 30-Percent, Reduce power consumption by up to 40-Percent and extend battery life,Faster burst access speeds for improved sequential data throughput.Compatible with macs that support 4GB DDR2 240PIN memoryAttention: As different production batches, there will be difference in chips brand, color and parameter.Before installation, please clean the connection finger gently with eraser and clean out the slots with canned air dont use corrosives, such as ethyl alcohol.Installation Steps:Step 1 Unscrew the computer case screwStep 2 Unscrew the computer coverStep 3 Press the buckles on both sidesStep 4 Pay attention to the space when installing memoryColor: black + greenMaterial: PCBPackage Contents:2 x memoryOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.