SMD Ceramic capacitor burned
There is a chance, that capacitor C2641 is of the same kind as C2640 because especially for consumer grade designs it is common to simplify the bill of materials by reducing the count of different parts. If you feel lucky, you could desolder C2640 and measure its capacitance. No guarantee that they are indeed equal!
To be sure you would need a schematic or temporarily desolder C2641 from a working card. Both is unlikely to be achieved.  

The package size of the capacitor can be identified with a caliper or by comparing to known parts.
From there take the highest voltage rating and best dielectric you can find in this package with the desired capacitance - assuming it is an multylayer ceramic capacitor MLCC.

Even if you manage to find an actually matching capacitor, there is a good chance that the error leading to the fried capacitor is somewhere else in the system.