I currently own the 4870x2 and I would like to know if the 5870 would be a better option to use? If I read right from places the 5870 is on par or better in performance than the 4870x2 and it uses less power. What I am mainly looking to do right now is find a card that performs at least as exact as the 4870x2 and use less power/watts. Would you do the swap?