Hello, I am trying to upgrade from the ATI 5450 to the GTX 460. The 460 fits fine in the case, however the bracket does not fit. At the bottom of the 460 bracket there are 2 prongs, however at the "slot" in the case where these would be inserted only has a single prong (which is what the 5450 has). This is my first component upgrade so I have no idea what to do. Any help? Thanks!!!