you need a graphics card, a dedicated processing unit for handling the intense graphics used in these high end games. an HD 7750 or a GTX 650/650ti is about the most i would reccomend for a dual core CPU (balanced and matched GPU's for that processor ). dont buy a GTX 780ti even if you can afford it (best GPU out right now) since the CPU couldn't even utilize its raw power, and this would be a waste of money. also tell us the EXACT model of power supply you have because it has to be able to handle the card too (added power draw)