DDR4 memory is a type of RAM memory that's intended for computers built after 2014. You can add extra DDR4 to make your laptop or desktop computer faster. DDR4 is available in different speeds, such as DDR4 2,133 or DDR4 2,400. You should always pick a speed that fits your motherboard. Additionally, DDR4 RAM is always specifically intended for either laptops or desktops.