I have a CyberPowerPC Gamer Ultra GUA250 and it runs online games beautifully, nothing wrong with the graphics and there is no lag. When I try to play offline games like skyrim or the witcher 2 I have to have it on the lowest graphic settings to have it run somewhat smoothly. My graphics card is a NVIDIA GT520. Anything I can do to make games playable or do I need to buy a new graphics card?