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 purchasing. And determine the maximum capacity supported by your computer. Memory Size: 4GB (2x2GB) High-Quality and Test: Adopt , , . All 100% Tested, 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 that support 4GB DDR2 240PIN memory Attention: As different production batches, there will be difference in chip's brand, color and parameter. installation, please clean the connection finger gently with eraser and clean out the slots with canned air 't use corrosives, such as ethyl alcohol. Installation Steps: Step 1 Unscrew the computer case screw Unscrew the computer cover Step 3 Press the buckles on both sides Step 4 Pay attention to the space when installing memory Color: black + green Material: PCB Package Contents:2 x memory Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.