I am trying to buy a graphic card and I had taken some of the information of the cards. They are as follow 4850 cf, 4850x2, 4870, 4870x2 this are the some of the graphic cards on which I had take the information in sequence. I necessitate help in selecting between these configurations or arrangements. Which graphic card is superior. I got instruction that every card has or can be used on 2GB of ram. Which is quicker? Which is the most excellent among them I need some help here.