Buy DDR SDRAM for your laptop to boost your performance and speed. This is older memory for older laptops so be sure to make sure that your laptop uses this type before purchasing. Laptop DDR Memory can be used to upgrade or replace the DDR memory in your notebook computer. Our Laptop DDR memory comes in sizes up to 512MB or 1GB. Laptop DDR SODIMMs come in speeds from PC2100 to PC3200.