Which project are you running this on?
Some of the projects are heavily optimized for particular classes of GPU's. You may be better off moving to a different project. I don't know that particular card but I think it's on the lower end of the GPU's whereas the Nvidia 480 is a very high end CUDA card.
BOINC will recognize most any high end cards, but I think the question is more which of the lower ones it recognizes.
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