If you know that make and model of the laptop, you can go to a website called Crucial.com and look up what kind of RAM it takes. When you get on the site, click on the Memory link at the top and follow the prompts on the screen. You can also click on a link to automatically detect what memory upgrades your computer can use. Just remember you do not have to buy from them, I just use it to tell me what upgrades will work.