I have this old computer and well it has a Pentium 4 and im planning to get this video card http://www.newegg.com/Product/Product.aspx?Item=N82E16814133391 and well i want to know if I get the video card will I be able tol play games like call of duty 4 and mw2 and bad company 2 on it along with games like TF2 and CSS. I have 4 gb of DDR2 ram and i am wondering if my computer can handle those games with out lag at reasonable resolutions. Will it lagg or should I save up for a new computer?