DDR3 memory is a type of RAM memory that's intended for computers built after 2007. You can add extra DDR3 RAM to make your laptop or desktop computer faster. DDR3 is available in different speeds, such as DDR3 1600 or DDR3 2400. You should always pick a speed that fits your motherboard. Additionally, DDR3 RAM is always specifically intended for either laptops or desktops.