Ok let me put this plain and simple, ram is not used for gaming, it is basically your computers extra energy boost, what it does is make multitasking and basic processing easier, how ever, your graphics card is what determines what graphics settings your computer can handle, to find out what graphics card you have, you can go here
http://www.systemrequirementslab.com/cyri/intro.aspx
just go to the link, click a random game, and what the site will do is run through your computer and tell you what your pc's specs are.
Now here is the confusing part, even though your graphics card might have all the essential parts these games need to run, ex: shaders, video ram, ext. since it is a laptop, the graphics card is probably an integrated graphics card from a processor( used to power your computer in a whole) which are usually crap, since they have no gpu like a dedicated graphics card.