According to Task Manager, my laptop uses DDR3 RAM. I currently have 4 GB installed and am using "1 of 2" Slots. Form Factor: SODIMM Hardware Reserved: 110 MB Speed 1333 MHz. I have not yet opened my computer to see what the slots look like. I want to fit the most memory I can into the available slots. I guess I should have opened up the computer and took a picture to show you guys before I even made the post?