Currently, there is a Geforce4 MX440 in my AGP slot. I'm looking to make a slight upgrade. But I want to know which is better, the X800GTO (here) or the X1600 Pro (here)? My next question is: I have a Dell Optiplex GX270. According to Dell it came with a 250 watt power supply. Will either of those two cards be able to run with that power supply (my guess is no). If my guess is correct would replacing the Geforce4 MX440 with a X1300 (here) be an upgrade? If so, would the X1300 be able to run on the 250 watt power supply?