Ram will not make that much of a difference on how fast an application will run, but it will make a difference on how fast the application opens. With Mame, I don't expect that you would see that much of a difference with RAM as the program itself it not that large, but Windows itself will start up a hell of a lot faster with more ram, and therefore less waiting around till mame is actually up and running from the time you turn the computer on. My Bartop take forever for Windows 2000 to start up, and I know it's because of the lack of ram. Once I get ---my bottom--- in gear and get more, then I will be happy.