Those metal fins are part of the heatsink and are there to help keep the graphics card cool. That bit of damage should not affect it much at all. It's hard to tell from the picture if the heatsink has bent and lifted from the board a bit also..that would affect its ability to disipate heat since it would not be contacting the processor properly. If that's the case, the worst that happen is the card would overheat during more demanding 3D applications (games), and shut down. You can monitor the temperature with software (HWInfo) and see. Anything over 80 celcius would become a problem. Other than that, it sjould be fine to try. Be sure to get your drivers from nVidia. It is NOT an AMD card.