The best way to know is to open the laptop's back panel and check what type of RAM is already installed. In this example, the ...

DDR4 is better than DDR3 graphics card in many aspects ... Read: How to find out Computer RAM, Graphics Card/Video memory of your PC. If you are a high-end gamer and want to enjoy the latest ...

This is because the pin configuration for a DDR3 RAM is different from that of DDR2 or DDR4, this is why you need to make sure that the RAM you buy must be compatible with your computer.