Recently I got MW2 and the fact that I was forced to play at 1024x768 and still get some lag made me realize that I needed an upgrade. Considering the 4870 only costs around $150 or so these days for the 1GB version, I figured I might as well take a leap and get a solid card that will last me another 2 years. However, the problem is that the rest of my computer is three years old and would probably bottleneck the card (see system specs). Unfortunately, I currently do not have enough money to invest in a completely new computer. Would the bottleneck be so severe as to reduce the potential of the 4870 to 4650 status, thus warranting a cheaper card, or should I go for it? Another main concern is heating issues, as my computer has always had serious issues dealing with overheating. I heard that the 4870 is a very hot card, idling at around 70. Would there be any better alternatives? Thanks for your help!