I want to buy the HD4850 palit version which has a dual slot cooler. I was wondering whether my power supply would be good enough as buying the card along with power supply will be too costly. I have a Umax 450W power supply which came with the case. It has 25A on the single +12V rail.I also have an AMD phenom 9550, 250GB HDD, 2 case fans and a DVD writer. I don't want to OC the graphics card or the processor.