I originally bought it to have the option for SLI (before I upgraded to the gtx260) and I just upgraded everything else in my PC except for the PS and VC. It's good to know it can handle the increased load.
Actually it would be a better idea imo to ebay your current GTX 260 and put that money towards an HD5850 or GTX 470. Once OCed you will get similar or better performance as well as DX11 and no SLI scaling/compatibility issues. The cost may even be less.