Thanks, that sounds a lot more positive. How are Dell's PSU's generally? It's 2 years old now so it won't be in it's prime but I don't keep it on 24/7.@ The Bass: They always overstate the power supply to account for all the crap brands out there that can barely output 2/3 of their rated wattage. Anandtech have the total system power draw for the 1GB card at 290w (Crysis) and 330w (Furmark), that's on an overclocked i7-920 test system with 6GB of RAM.
So depending on the quality of your PSU and the number of components it's powering, you might need an upgrade or you might not.