I bought this laptop to replace another Samsung, disappeared as the robbery of my apartment. I offered him a memory module that I installed on the second memory slot (original empty), making him 8GB of RAM. Be careful not ... On this laptop battery is not removed, so you have to disable it first before any work if the material remains electrically powered !!! There is a small hole under the notebook in which you have to press with a paper clip to disable the battery before removing one of the elements of the machine. Then mandatory starting with the power cable to reactivate the care of the battery. For me the small catch is Windows 8. After 3 weeks of intensive use, and even with Classic Shell that installs a true "start" menu and an opening directly to the desktop, I still can not m ' do there. So back to Windows 7! The operation is somewhat delicate and reserved for experienced IT professionals, but once everything installed, I found myself finally, what happiness!