Hey guys. I was going to get the radeon 6450 for my aging slim pc. Strangely my integrated graphics have actually managed to do games like wow and total war pretty good. In Wow i currently get like 30 fps on fair. If i do get this card would it lower my performance? Would I need a larger power supply? I currently have a 220 watt power supply and I have not found any power supplies for my slim-line pc, the SX2840