The computer has 4GB. I just purchased a Kingston HyperX Blu Desktop RAM, 4GB DDR3, 1333MHz. It would bring me up to a total of 8GB. Any suggestions as to whether this is a good type of RAM, or whether I should return it for something else, is appreciated. I was going to open up my PC at the end of the day and stick it in a slot (or at least they make it sound that simple on the package)