You can mine with it, but your best bet might be to sell it and buy a 5830.
Ok so Nvidia's aren't very good for mining? And is CUDA the only option for Nvidia users? Thanks.
Nvidia = CUDA = better at vector math, very good at matrix manipulation, requires 3 instructions per cycle for integer math
ATI = openCL = integer math = exactly what you need to calculate sha256 hashes (bitcoin blocks), does integer math in 1 instruction per cycle
edit: oops forgot the link https://en.bitcoin.it/wiki/Why_a_GPU_mines_faster_than_a_CPU#Why_are_AMD_GPUs_faster_than_Nvidia_GPUs?