Currently I am (2) Quad FX 4800 video cards and prior to this I work with Autodesk Inventor 2011 and recently bought. I would like to run my two cards in SLI mode. This is not an option on my 3D controls tab in the Nvidia control panel. Even I have an MSI bridge, will this work. Ddoes it need to be a certain model? My computer is the Intel i7 model running XP 64. I am also having issue with power supply only pumping 750W. Is there any solution to this issue? Please help.